Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3f16e54396e157…

MALICIOUS

PDF

49.5 KB Created: 2020-08-04 15:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad625dd686afac92a5d22c996d929367 SHA-1: 8f0da5b5b5ea709a9b554f6a061b71301e7c5a3d SHA-256: 9a3f16e54396e1578cf39ac78620b1a6d44e34225d5a40310c5186aec93915ea
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate academic papers, but the primary link redirects to a known malicious infrastructure. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL and several other URLs that are part of the link farm, likely intended to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=biophysics+r+n+roy+pdf
    • http://files.samecommunityvt.org/uploads/1/3/0/7/130738993/4146218.pdf
    • http://debobaxo.dammannfarms.com/uploads/1/3/0/8/130874431/todobofowibugom_wekulemapuf.pdf
    • http://files.allsaintscresson.org/uploads/1/3/1/4/131437987/liwopugo_pegimorogajowe.pdf
    • http://files.elenagorlova.com/uploads/1/3/1/3/131398372/nofimu_pazemenovigomir_nudowuxa.pdf
    • http://files.suicidalflower.com/uploads/1/3/0/7/130776042/407576.pdf
    • https://cdn.shopify.com/s/files/1/0432/9321/2827/files/32578622173.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/13795669976.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5126/files/nunidukejepasikalefevo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/79213310897.pdf
    • https://cdn.shopify.com/s/files/1/0435/7183/9135/files/80916014392.pdf
    • https://cdn.shopify.com/s/files/1/0436/6378/6137/files/86165777079.pdf
    • https://cdn.shopify.com/s/files/1/0431/0299/4586/files/pudilisizebenedu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/me_late_resultados.pdf
    • https://cdn.shopify.com/s/files/1/0434/2792/2076/files/78970020498.pdf
    • https://cdn.shopify.com/s/files/1/0437/1962/2808/files/diliza.pdf
    • https://cdn.shopify.com/s/files/1/0435/2435/8308/files/minecraft_server_update.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/razevajuvof.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/brooker_biology.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007890.bin
6cbed6e982ca6d0ff863f16af0ac212d8346b6b63a1a6297947628465f8c59fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7890 4744 bytes
font_01_sfnt_off00008899.bin
fe1420514133c01cef499711a011de50fd97cd07b3388bc1f6580631ec2523b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8899 9920 bytes
font_02_sfnt_off0000aa8f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA8F 4324 bytes