Malicious PDF — malware analysis report

Static analysis result for SHA-256 723e5b86eea59e13…

MALICIOUS

PDF

42.3 KB Created: 2020-08-09 22:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3187ba48bb484a51550d4768faf320b9 SHA-1: d74a669f27e22a2ee924d5b620062d9fdb532b18 SHA-256: 723e5b86eea59e1377711b3a376aaffcd8fd978b2e22ab7ded65fe47cfbbfd49
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.com/pify?keyword=covalent+bonding+lewis+dot+structures+worksheet+answers+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating the primary intent is to redirect users to malicious infrastructure.

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.com/pify?keyword=covalent+bonding+lewis+dot+structures+worksheet+answers+pdf
    • http://files.cornerstoneteen.org/uploads/1/3/1/6/131636914/dolaxilo.pdf
    • http://files.wyatttietzfoundation.com/uploads/1/3/1/3/131383318/tupezeguxo.pdf
    • http://files.diasandbias.com/uploads/1/3/1/4/131412032/xasafosifetas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2626/6782/files/arc_tennis_elbow_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7678/files/opera_hotel_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/9354/8444/files/negimijidirubodal.pdf
    • https://cdn.shopify.com/s/files/1/0430/8611/9079/files/81210048223.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/xoxikizevifijazebopebi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4044/0471/files/43612045397.pdf
    • https://cdn.shopify.com/s/files/1/0429/6251/8182/files/23111353435.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6597/files/2100624575.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5247/files/42942789596.pdf
    • https://cdn.shopify.com/s/files/1/0434/6281/9990/files/clicker_keypad_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/jufezid.pdf
    • https://cdn.shopify.com/s/files/1/0436/3495/0304/files/widewoxijudefozenunov.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_off0000656d.bin
2d005da6d730950aea9d08188218d5fd12ae1d174c9f32aacd0cf4f81bff3783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656D 5676 bytes
font_01_sfnt_off000078c5.bin
fb4ad0aaa9d18b0816ca7d40cbd2e24298f4bb7a46025ede80a7dc2dffa132ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C5 10180 bytes

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