Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5249c98acc556e…

MALICIOUS

PDF

39.5 KB Created: 2020-08-10 23:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e814cc1b53f5e3ae1cc1021c1a15ebaf SHA-1: e7b4c70cdb0e93488c6dc5f5f7ccdcda63c0fc21 SHA-256: 4b5249c98acc556ecf67fa16a93f79551a72dff2ea21b5c12732bd1e3e5c7496
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.cc/pify?keyword=fanuc+cnc+turning+programming+pdf'. The document body, though heavily obfuscated, contains this URL and appears to be a lure for programming-related content. The presence of a link farm and the ML classifier's high confidence further support the malicious classification. No scripts were extracted from this sample.

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.cc/pify?keyword=fanuc+cnc+turning+programming+pdf
    • http://nugukib.drlindaford.com.au/uploads/1/3/0/8/130873995/c49fc8266e.pdf
    • http://fofok.jennrudel.net/uploads/1/3/0/7/130740069/jegusubopaval.pdf
    • http://files.justinlowman.com/uploads/1/3/0/9/130969300/86dc38d9d9.pdf
    • http://files.viptowingcorp.com/uploads/1/3/0/8/130874118/morekigagigobid_numajimipuwoze.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0711/files/96714748765.pdf
    • https://cdn.shopify.com/s/files/1/0431/2462/1473/files/bilirenowome.pdf
    • https://cdn.shopify.com/s/files/1/0430/5177/8202/files/40001719602.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0799/files/talujejosalojejuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3514/7933/files/gitijomaravemexowi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4147/9066/files/81056681803.pdf
    • https://cdn.shopify.com/s/files/1/0433/7873/7302/files/printable_calligraphy_practice_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/sword_art_online_volume_16.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/blunders_and_brilliancies_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/9159/7214/files/23790921237.pdf
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/salupiwekekir.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/mupaveges.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/73830705774.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bc4.bin
d6c5ac4997082dd65ed3e15d07f802b79b05e6ffe70f46dcddd8a03829cd2039		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC4 5220 bytes
font_01_sfnt_off00006d6f.bin
8867cc7da16cb77f5bb2f1f0b7db025fb9a72c9f59badc34e8b8eca2368a03bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6F 10388 bytes

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