Malicious PDF — malware analysis report

Static analysis result for SHA-256 12425fa756f9cb88…

MALICIOUS

PDF

47.5 KB Created: 2020-07-29 18:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4a0cc290c4bd7d68a57858b6c2f9c0d SHA-1: 303be43d129fe3c27dfc597476e4086e7b196e18 SHA-256: 12425fa756f9cb88f6faf7d15a47639ed8f8618a8bea3765052d6546e9dace36
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a phishing or scam attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly suggest this. The document body, though heavily obfuscated, contains keywords related to accounting exercises, likely used as a lure. The ML classifier also flagged this PDF as malicious.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=contabilidad+asientos+contables+ejercicios+resueltos+pdf
    • http://files.twinsilosfarmnigeriandwarfs.com/uploads/1/3/2/6/132695571/ed0480.pdf
    • http://files.studioplumpiano.com/uploads/1/3/1/3/131383497/70178f76b.pdf
    • http://files.dawnsgoddessdiaries.com/uploads/1/3/0/8/130874118/lives_kakalazugukaban_lugevebeveparan_tezojaxezik.pdf
    • http://files.allseasonspr.com/uploads/1/3/1/3/131383959/defogetegebasusumo.pdf
    • http://files.altaanz.org/uploads/1/3/0/7/130739740/dewafudabota.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6671/0433/files/21829756421.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/xabazomifab.pdf
    • https://cdn.shopify.com/s/files/1/0431/2530/9604/files/videwoxinasawolokotujatep.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/58436501724.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/zujotetuxejenifeso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9655/6191/files/11294626501.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/3233091614.pdf
    • https://cdn.shopify.com/s/files/1/0441/2804/3160/files/virazozuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91146339154.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/mugid.pdf
    • https://cdn.shopify.com/s/files/1/0429/2316/3801/files/fasidegofaz.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_off0000770c.bin
f8b116c7b181f3f4c32eeae67523597d55c66a09db1fb6ea6704974ba6a59446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770C 5268 bytes
font_01_sfnt_off000088ff.bin
efa00b8bad1fe91aba0218869cb0b8f61fe7595bbd89a87c3d659cc0ec79e240		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88FF 11552 bytes

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