Malicious PDF — malware analysis report

Static analysis result for SHA-256 a497cc33f7cab3e4…

MALICIOUS

PDF

44.9 KB Created: 2020-09-18 13:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbb481835154a83514008ee58ddd4dbb SHA-1: 8ff428205282a2301a6185fa9ef5861a5a1b5a8d SHA-256: a497cc33f7cab3e43b2f62461191cc517eeb5f26c8ef97eb7d1b6f918d047195
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector infrastructure, specifically 'ttraff.me'. The document body, though heavily obfuscated, appears to contain the same URL and a list of other URLs, suggesting a link farm or redirection mechanism. The ML classifier strongly flagged this PDF as malicious. The primary attack vector is likely social engineering via a deceptive link within the document.

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.me/wix?keyword=alfred+adler+theory+of+personality+summary
    • https://cdn.shopify.com/s/files/1/0436/4677/9552/files/vefulix.pdf
    • https://cdn.shopify.com/s/files/1/0437/0880/9384/files/97486401300.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/14431685402.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9603/files/pneumatic_valve_operation.pdf
    • https://1b848a11-52ed-425e-b1e5-a1f89e546c50.filesusr.com/ugd/96564c_540d7d6492734552894fd66e1c011152.pdf?index=true
    • https://9e79a79b-9c3d-405e-ac0a-fa02abd88fc4.filesusr.com/ugd/d1c05f_aead9f98e0f349978b1961acdba3d441.pdf?index=true
    • https://71b85555-3cde-490c-aeda-2d8eb3be7db4.filesusr.com/ugd/d6b5da_24f0f60f7d33450895f0be96e8815b23.pdf?index=true
    • https://bcbd4c1e-ef5a-492e-8027-303b2ef1ca07.filesusr.com/ugd/76de1a_95b46bc1033c49199a24d2e21fe9fecd.pdf?index=true
    • https://3d7bad21-4277-4329-b69e-687efb6c01ac.filesusr.com/ugd/4cd51e_f53b8b3247584083afb0bbb7d4c6b426.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0450/2798/3510/files/69533409617.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/xesulej.pdf
    • https://1d5bea97-2fd4-4a8c-b8e1-e6ad126ed21e.filesusr.com/ugd/d63aaf_23b911ddfbd0459cb4a1cbc8ded1ecc0.pdf?index=true
    • https://f4d1cda4-4435-48f2-b8b0-f8dba2093da3.filesusr.com/ugd/c8683e_f4e491c7e4714ae0b1099131b43c4a1c.pdf?index=true
    • https://b757fb38-2a51-4b86-9487-bd85f70a0ac3.filesusr.com/ugd/eb4c03_e23ca104d4bc436b99034ce280ab3d61.pdf?index=true
    • https://713c483a-ead7-4101-8ff0-480c0cfc479c.filesusr.com/ugd/6f7357_56b298181cf6467d9a661ded1f33f92b.pdf?index=true
    • 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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006585.bin
5e85fe47d78138726070756445e7f5f77151d9bc475f9a52c252cfbd087c8f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6585 5252 bytes
font_01_sfnt_off00007735.bin
8b47c35e9f7b3f69480046324298e00fb9ea65306243cd710a0ad5c80ded3c6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7735 9716 bytes
font_02_sfnt_off0000984e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x984E 4324 bytes

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