Malicious PDF — malware analysis report

Static analysis result for SHA-256 670fc5b4d9713008…

MALICIOUS

PDF

40.2 KB Created: 2020-08-17 15:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db8dc5e9893e5472214ae342a999a2b8 SHA-1: d033b1f86e32cc497386b842a455c2904242175f SHA-256: 670fc5b4d97130082be916cbd187218cce8063937247c6a800b11684bcb46e85
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'Brinno construction camera manual'. The presence of a link farm and a malicious redirector strongly suggests this PDF is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

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.ru/pify?keyword=brinno+construction+camera+manual
    • http://files.quitecontrarybymary.com/uploads/1/3/1/4/131437676/89861214e1ac.pdf
    • http://wogifaka.aubreesbullmastiffs.com/uploads/1/3/0/7/130775386/f70dc278234.pdf
    • http://files.ladygangmusic.com/uploads/1/3/1/3/131383772/2848f66c8.pdf
    • http://files.saintbrendans-online.com/uploads/1/3/1/4/131454286/xurixitiwo-morasidurexibo-dubedi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/76148192747.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/dragon_quest_characters_torneko_no_daibken_3.pdf
    • https://cdn.shopify.com/s/files/1/0438/1691/1010/files/ropigodo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6637/files/sawed.pdf
    • https://cdn.shopify.com/s/files/1/0435/5021/2264/files/caterpillar_generator_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/minecraft_house_mod.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/lamopuxerageluxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/zunojogudisobodujupajusar.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/kanugesopijederori.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/98322123221.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_off00006196.bin
269a84e16e59c9125150fb8cb6dc75ba6305a22628976ae76d1e9329b06361d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6196 4996 bytes
font_01_sfnt_off0000726f.bin
0a2c9022cb5abe4283b581bffea1b665aa6bd87e690b32e5db846f0e2b780c4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x726F 9852 bytes

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