Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a556be23bb94564…

MALICIOUS

PDF

40.3 KB Created: 2020-07-27 17:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83567e3eaa271044172336f10ffebc9a SHA-1: 51e3c2f1a026975835f946c4bbc09ff1de2bba21 SHA-256: 7a556be23bb94564fb6e32af2b5e3c36533f313e0fdaaf4475b7b721440a9b95
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=diamond+roasted+almonds+nutrition+information
    • http://files.rachelsword.com/uploads/1/3/0/8/130814935/jivuleru-xifitisusisit-nobajaxaluzoke.pdf
    • http://files.talgolani.com/uploads/1/3/0/7/130739022/lipenovizilosuzufazo.pdf
    • http://files.highyellowcurlz.com/uploads/1/3/2/7/132741764/zafugodorep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/7537853914.pdf
    • https://cdn.shopify.com/s/files/1/0436/0490/2045/files/seledezupin.pdf
    • https://cdn.shopify.com/s/files/1/0440/3747/2421/files/67724688691.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/20307592736.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/puliwaxaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/2155/6117/files/tavatixonuzu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/9178985322.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8135/files/79299194443.pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7605/files/6227431624.pdf
    • https://cdn.shopify.com/s/files/1/0438/2828/1506/files/88793239457.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8423/files/29859030538.pdf
    • https://cdn.shopify.com/s/files/1/0436/9452/2518/files/dodikexotopanap.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006068.bin
af8c30d56d49a55fe4da6e05d575bad26f7a5bdfd60fe7ec5d92e48b5547b30b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6068 4936 bytes
font_01_sfnt_off0000710f.bin
aaedc9800d66652ff9317d0a6cee792c9dea95a6ac526676346d640b535c456b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710F 9708 bytes

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