Malicious PDF — malware analysis report

Static analysis result for SHA-256 b847c3af71fc9660…

MALICIOUS

PDF

46.5 KB Created: 2020-10-17 02:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6cd2b5a99c4c6620e4ce40ec9b26a993 SHA-1: 5a6a28e048fb019acac2b29d697cbeaf2d2aaf10 SHA-256: b847c3af71fc96604cd8891b96d97f9c32f8d2642b6714df93c55e84be52fcea
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting, designed to redirect users to malicious infrastructure. The document body and embedded links suggest a lure related to 'message spoofing app for android', which is likely a pretext to encourage clicks on the link farm. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/123?keyword=message+spoofing+app+for+android In PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/14346ebfa70b652.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/4f51f5465.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/90689.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/6276310.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/ddc9efb.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/6808592.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/devuxupujikeninaferi.pdfIn PDF document text
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/8891903.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/xekena.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/ad9d4.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/vijepi_wusata_vasiresom_misijatiropori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2732/8935/files/fragments_of_horror_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1969/7303/files/lab_safety_cartoon_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6904/6935/files/lake_powell_fishing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8628/7519/files/luxatuluxirinado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4324/4200/files/vekisixuzewow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a3333bf-8634-4782-9b22-cca4f8ec78c2/volejovafesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8fa88a-894d-4b44-8192-7e7a04568c58/la_lengua_que_heredamos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e648f11-4755-4b09-80ae-ed21c8c62caf/51460547600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/947c49cd-2899-4a32-a0cd-92591462284b/42386221776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59399bfc-49ff-4b54-9c38-54a17418db04/minaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7672aac8-0487-403c-8365-d0e3929c301c/1003225434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c92b8db-6425-48e5-8075-3d4994957b03/guvugitufumunulosor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d78b9ee5-b01a-4b4d-b693-bf7e3b88fe3f/fuwarubofidivo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7695 5180 bytes
SHA-256: 60e2c61fe7f9cb33351af812c2ab4c09f88c86d0dd7f15f134bb2b5208e472fa
font_01_sfnt_off00008849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8849 10548 bytes
SHA-256: 28acf656d5d0f61a4e7b2e9f2e41260d37250ae573394f4256ab9fac8b6c49c7