Malicious PDF — malware analysis report

Static analysis result for SHA-256 6628bc34bc788d68…

MALICIOUS

PDF

47.7 KB Created: 2020-07-11 02:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 1bb58d77842dd3762c4267fe4c5e02b9 SHA-1: 5bb8aa32ded79affe090b82e350c6e30bb3a4892 SHA-256: 6628bc34bc788d683d9b687e9701ce12f533d1b71363194d0baeb71b7d4fabff
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable domains and redirectors, indicating a link farm designed to distribute traffic. One critical heuristic identified a link to known malicious redirector infrastructure, and the ML classifier strongly flagged the PDF as malicious. The document body itself is heavily obfuscated but contains URLs that are also present in the link farm.

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.com/pify?keyword=blended+learning+journal+pdf In PDF document text
    • http://files.restorativejusticepartners.org/uploads/1/3/1/0/131070979/kigugutemibug.pdfIn PDF document text
    • http://files.hestercox.com/uploads/1/3/0/8/130874613/vejifusaxupipeworama.pdfIn PDF document text
    • http://files.theyogaschoolny.com/uploads/1/3/0/7/130775942/668541.pdfIn PDF document text
    • http://files.catheymccrary.com/uploads/1/3/1/8/131871480/472de31.pdfIn PDF document text
    • http://files.ayefilmstudio.com/uploads/1/3/0/7/130740480/6273346.pdfIn PDF document text
    • http://files.sealedremnant.com/uploads/1/3/1/4/131438682/bebavub.pdfIn PDF document text
    • http://files.hburghda.com/uploads/1/3/2/8/132814476/5eeeb261.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sotetusuveti.files.wordpress.com/2020/07/fofevikukobawix.pdfIn PDF document text
    • https://pisurika.files.wordpress.com/2020/07/noduxanelonixiguxubuf.pdfIn PDF document text
    • https://sujotupuro.files.wordpress.com/2020/06/lekafudogasinipamim.pdfIn PDF document text
    • https://jerobure.files.wordpress.com/2020/06/kotawerevavinug.pdfIn PDF document text
    • https://gamekupori.files.wordpress.com/2020/07/diguzupevigerise.pdfIn PDF document text
    • https://faxotobajej.files.wordpress.com/2020/06/66236813884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/92141002077.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexanenivoxepabulolud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000776b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x776B 4960 bytes
SHA-256: c1f8f0637c442d8cd188fb82d59a28cb34849b8ca7cd7390130d4bdb89f99602
font_01_sfnt_off00008852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8852 12788 bytes
SHA-256: 04a401fac00d19b7fa1dba21cc45ee85602812ca2e2558a9d8c256590afb5895

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