Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcf78ae72161787…

MALICIOUS

PDF

44.7 KB Created: 2020-10-16 18:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 96774cdb6812f0d4d45a44d5f295b9dd SHA-1: edb5a0bacd423aa34672bbdbba794b50a9ed968d SHA-256: 5fcf78ae72161787dde503c300a1265fc865368f71dd01a8c32e3d7312c76ec2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to disposable hosting and redirect to malicious infrastructure. The primary malicious URL identified is https://ttraff.me/123?keyword=adding+and+subtracting+fractions+worksheets+grade+4, which is flagged as a malicious redirector. The document's content appears to be a lure, using educational keywords to disguise its malicious intent. The ML classifier strongly indicated maliciousness.

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=adding+and+subtracting+fractions+worksheets+grade+4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f872600527a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f86febc12787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f8935ba82696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5f88912bec7d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f882c6f3b11c.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/bufobusenaw_novusasewajo_dawaturu_pabevidoru.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/fasutekudejaxox.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/sidejeko_daradilet.pdfIn PDF document text
    • https://nurekagenarufab.weebly.com/uploads/1/3/1/6/131636906/vagetalog-juxifemaragepux-bobedel-kifal.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/deguwoja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3555750-8a31-474c-a2c5-f148c9542184/21684059300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1819d445-9598-4200-9b59-56128bec07c8/ridabez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/279e6429-5d07-4d0f-97dc-a7f148a6f96c/wonikoxujevules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36538f5-324b-4852-87af-a944fcc9d19b/ditinevudofakofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/360b73d1-a3f8-4df8-b466-68b4d5096c19/jesulebifatodikojonudax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604d4de8-f233-4c5f-8903-f32d0d8be077/xapokimitisufasizisoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71c396a-9867-4812-bb6b-ca9e9774832b/32986083638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9e3e7e-ab9e-4f15-a66c-fa88f5ecab15/3427070426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0067ce7-2dcf-429c-9d77-41fe73d4f4ff/manalepurevoror.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/4160/3762/files/sr5_adept_powers_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5912/0794/files/58899112486.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2610/8575/files/sefivegetuwamirojeparo.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_off00006d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D86 5624 bytes
SHA-256: 1725616bdb99c5621a3798a18d197ae6fd3fcde01ef1ce31e8102a623c2303b2
font_01_sfnt_off000080ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80AE 10584 bytes
SHA-256: 188d473d7d824c9be6c55d5e03d1a3900fdd7bc68267997f10f71c23178bbd47