Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e94b10a5335eab…

MALICIOUS

PDF

69.6 KB Created: 2020-07-31 08:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff373ac13d16aea42941a6f95496b6e7 SHA-1: d6417c5aae1e61e87a4658cb2213ae84f3ab2baf SHA-256: 81e94b10a5335eab454effabea0d0a18eae89f84434c26f0f7f68ad4711f7077
162 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, suggests a lure related to 'ante mortem inspection of meat pdf'. The presence of a link farm and a malicious redirector indicates an attempt to lead the user to malicious content, likely for further exploitation or phishing.

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.cc/pify?keyword=ante+mortem+inspection+of+meat+pdf
    • http://files.bresumbrella.org/uploads/1/3/0/9/130969659/filila.pdf
    • http://files.primaryds.com/uploads/1/3/1/4/131406610/vewozopune.pdf
    • http://files.alliedrenew.com/uploads/1/3/1/3/131379789/rugolapajusipop-xarodovowe-lelag-womure.pdf
    • http://files.afterhoursfilmsociety.com/uploads/1/3/1/3/131379343/fogusinivixu-xigiseje-mekira.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/bukoludozowunipuranojedup.pdf
    • https://cdn.shopify.com/s/files/1/0429/3361/6803/files/90765185947.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/35571862406.pdf
    • https://cdn.shopify.com/s/files/1/0437/3161/5909/files/xosegu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7605/files/46301634361.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/fujitudapediditebepevi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/14487707883.pdf
    • https://cdn.shopify.com/s/files/1/0433/6343/4654/files/1684948162.pdf
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/38497487091.pdf
    • https://cdn.shopify.com/s/files/1/0433/1808/3742/files/silipamaxubade.pdf
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/fibidodawogalago.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2133/files/famalesevox.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/37603258402.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/61451791552.pdf
    • https://cdn.shopify.com/s/files/1/0435/6905/3854/files/33052909459.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_off0000d461.bin
2d8f8c3881bb027b3900258a79d1a324301219117baa72134c47d27deeb5a23c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 5048 bytes
font_01_sfnt_off0000e567.bin
83f7968e25c836a96621fbd9b63cc7ce6de8baa581069b9a04e35344879d4dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 10396 bytes

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