Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a3fb989e6ceefc…

MALICIOUS

PDF

34.4 KB Created: 2020-08-09 06:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a38de8d70c01e90bb9f2e6e0ac0d439 SHA-1: 9416a758fbdd2bd32aceb1bb9a5caf0d739b605a SHA-256: a7a3fb989e6ceefc45e6b07b05d0ce8b945cae5475075315ac7a2d1f57f42fb0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources, many hosted on cdn.shopify.com. The primary malicious URL identified is https://ttraff.cc/pify?keyword=1117+adj+pdf, which likely serves as a gateway to further malicious content. The document body contains obfuscated text and the same malicious URL, reinforcing its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/pify?keyword=1117+adj+pdf
    • http://files.whatthefoodfilm.com/uploads/1/3/0/7/130775968/5185820.pdf
    • http://files.catholicfamilycelebrations.com/uploads/1/3/1/4/131437636/5805799.pdf
    • http://files.lordandnikes.com/uploads/1/3/0/7/130740211/muforel.pdf
    • http://files.redlakeclinic.com/uploads/1/3/0/7/130776351/230a1e27db5c0.pdf
    • https://cdn.shopify.com/s/files/1/0429/3600/8870/files/78065618396.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/nanome.pdf
    • https://cdn.shopify.com/s/files/1/0429/3958/0575/files/educational_psychology_research_topics.pdf
    • https://cdn.shopify.com/s/files/1/0434/3280/4504/files/9476342152.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/vokilatajutukisawopogofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/79726195734.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/yugandhar_kadambari_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9328/5277/files/vaxabagimadewumopego.pdf
    • https://cdn.shopify.com/s/files/1/0430/6835/8807/files/27047910789.pdf
    • https://cdn.shopify.com/s/files/1/0432/1198/0964/files/runasazinimij.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/94400835399.pdf
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/diesel_kiki_injection_pump_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/5023616841.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a1a.bin
4824466c521cd42e6decf91301453150dee34aadf14380acb04c1dd893b7c4d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A1A 4844 bytes
font_01_sfnt_off00005abd.bin
375dcb095a2fd6bae2b9b15e818c6483a6fa5451fbca6df268db2d511dafa880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABD 10248 bytes

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