Malicious PDF — malware analysis report

Static analysis result for SHA-256 8917416c630c8615…

MALICIOUS

PDF

40.1 KB Created: 2020-08-21 07:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a729ad63561b09f3f221a043b70cc7a SHA-1: 64dab5747a4ae3ddd01f0e8a15d50208c16ba778 SHA-256: 8917416c630c8615e8edfae87284a679cd87b30408f41d654374452737109486
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, and one specific link is identified as a malicious redirector. The document body text, though partially corrupted, includes phrases like 'Aol email attachment' and the malicious URL, suggesting a phishing or social engineering lure. The ML classifier strongly indicates maliciousness, and the presence of numerous PDF links points to a link farm or redirection strategy.

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=aol+email++attachment
    • http://rozedon.sustainablerecovery.net/uploads/1/3/1/4/131407406/600719.pdf
    • http://vitavuf.john4rmcsd.com/uploads/1/3/1/4/131438405/7773058.pdf
    • http://files.michaelcozzaglass.com/uploads/1/3/2/6/132681740/bosoj_tazedasejopa_miroguwofux_bilaxanela.pdf
    • http://nilumaf.macleanhighschoolcareers.com/uploads/1/3/0/7/130740510/tefeligo.pdf
    • http://files.ninemillionbicycles.com/uploads/1/3/1/4/131453651/wowekilomerijulig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/nightfall_in_middle_earth.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/65062904549.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/ruveguvekerezewujavutazop.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6530/files/rejudupavazizugota.pdf
    • https://cdn.shopify.com/s/files/1/0431/0938/4345/files/72173457700.pdf
    • https://cdn.shopify.com/s/files/1/0436/4579/6512/files/nepajonido.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8971/files/39988518049.pdf
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/47966881253.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/livro_o_cristianismo_puro_e_simples.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/73720327557.pdf
    • https://cdn.shopify.com/s/files/1/0429/7516/6620/files/78244827018.pdf
    • https://cdn.shopify.com/s/files/1/0428/8210/5511/files/fuxolaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/archero_hack_apk_1._0_9.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_off00006036.bin
09a4e5f766509e0f42452730d5fddd21ab32f5ea597a4b0043f216983358e0fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6036 4752 bytes
font_01_sfnt_off00007038.bin
ebe14a02efd4a41ad220dedc4f4f0edb48d285b7fb07278e540f9977bb107330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7038 10396 bytes

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