Malicious PDF — malware analysis report

Static analysis result for SHA-256 63df85ddd33e2fa7…

MALICIOUS

PDF

57.5 KB Created: 2020-09-05 08:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34d311f14d1c396a4b290295995516b6 SHA-1: 33aadd731bd44fe69e154f9bedc00dcfcdd97db4 SHA-256: 63df85ddd33e2fa7f7c293c120456ec4aa63e33e4c369b205de08495761143c1
162 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, with one prominent URL leading to a known malicious redirector. The document body text, though garbled, contains keywords like 'Warning letter absenteeism without information' and includes the malicious URL, suggesting a social engineering lure. The presence of numerous external PDF links also indicates a link farm, likely used to distribute malicious content or phish users.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.club/wix?keyword=warning+letter+absenteeism+without+information
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/nobitimufuvise.pdf
    • https://cdn.shopify.com/s/files/1/0433/4708/3418/files/texas_odometer_disclosure_statement_form.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9208/files/62620631283.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3eeb3ced771494d89cdb5f217548af8.pdf
    • https://static.usrfiles.com/ugd/a8cc01_4ad6e0c74adf401ba699685a42b68981.pdf
    • https://static.usrfiles.com/ugd/822ecd_deedf374815e48a3b7030cfd25aa1409.pdf
    • https://static.usrfiles.com/ugd/9c8fb9_9e799869bed845f6981624a2ccb81e41.pdf
    • https://static.usrfiles.com/ugd/c1de29_7a4fd753aceb45c68c462880cd7f057b.pdf
    • https://static.usrfiles.com/ugd/badafb_ff27adb1931445b2aa1befe995fd488d.pdf
    • https://static.usrfiles.com/ugd/5a1791_52e98648689447bd999a194c5271a10d.pdf
    • https://static.usrfiles.com/ugd/e3325f_ec1ed9b5d35f44beaedb760c269cf447.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009328.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9328 2828 bytes
font_01_sfnt_off00009d23.bin
35f4e8d7463eba55a5e2a6728bd862ea194815001e8c244f83ee7806ac62b1a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D23 5428 bytes
font_02_sfnt_off0000af8e.bin
5ca3a892c2d8b0330bd94a3d0b5b95c817b3b6734aa14a99f7fdfa26b67f6119		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8E 12916 bytes

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