Malicious PDF — malware analysis report

Static analysis result for SHA-256 821c0e24b4fcf306…

MALICIOUS

PDF

49.0 KB Created: 2020-07-30 13:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dd808e9bcd012841b790a9071b5fa44 SHA-1: e2000b5ff3f1f0b721c4811682b45a1e5e71d617 SHA-256: 821c0e24b4fcf306b3b720569c1f9d3b8e770696568a44161a0d920c6bfe731b
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for malicious redirector links, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, suggests a lure related to 'careers', and the embedded links are part of a link farm designed to appear legitimate. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=list+of+careers+a+z+pdf
    • http://files.theshapesmithbrisbane.com/uploads/1/3/0/8/130874192/zajagufaxodamaxomeki.pdf
    • http://files.reneeyates2math.com/uploads/1/3/1/3/131382141/paziwuduvukoxalevof.pdf
    • http://files.thefitgirls365.com/uploads/1/3/1/8/131856666/sejamifuxilexidefu.pdf
    • http://files.oddbrainenterprises.com/uploads/1/3/0/8/130874241/makebeguguzopojebe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vizinedidobirefeguj.pdf
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/14779374677.pdf
    • https://cdn.shopify.com/s/files/1/0430/1779/7785/files/vubitevekujijiko.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6672/files/vuzefimixawelel.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/dijivar.pdf
    • https://cdn.shopify.com/s/files/1/0432/1230/8637/files/nezapakogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/22087770892.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/94925470997.pdf
    • https://cdn.shopify.com/s/files/1/0429/0209/3987/files/79663869757.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/87835712488.pdf
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/lusamexo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9220/4950/files/2436923830.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_off000083e3.bin
26fa0a3c983b06e5e82758360d052f1b60f50fef74a9adf2fdce00c34d9ff5f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E3 4788 bytes
font_01_sfnt_off00009440.bin
e0858c7d675c79ba64879690fab3fde0df94c4c3eecfe82f000c6ce87493567b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9440 10252 bytes

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