Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c3c5af20cc7848…

MALICIOUS

PDF

45.1 KB Created: 2020-08-03 00:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bf4baedbcd7d863dbe6a0b6c5ad5d13 SHA-1: 2dc10bc1c2ea5a42eecd7e3bb578d406ce86e068 SHA-256: 67c3c5af20cc7848b81ff4bc2a6b947563b24758319cc30190172aa6ae1a0ec6
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a lure for "Wonderlic test pdf with answers". The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits.

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.ru/pify?keyword=wonderlic+test+pdf+with+answers
    • http://files.yourendoflifeguide.com/uploads/1/3/1/8/131856330/cf7626e9.pdf
    • http://files.gamblefamilyquarterhorses.com/uploads/1/3/1/4/131406507/xikojorimiwekiv.pdf
    • http://files.milepost0creative.com/uploads/1/3/1/3/131380177/tevebi.pdf
    • http://files.judyandjonathan.com/uploads/1/3/1/6/131636819/ee7709d326344.pdf
    • http://files.traceyg.com/uploads/1/3/1/1/131164387/zuxudolevofu_sugen_tomuxejuvu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5349/8019/files/28048013433.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64831632673.pdf
    • https://cdn.shopify.com/s/files/1/0438/2490/6397/files/xeponoxaseju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0602/5128/files/7070503912.pdf
    • https://cdn.shopify.com/s/files/1/0431/2635/8173/files/13153225389.pdf
    • https://cdn.shopify.com/s/files/1/0431/1662/6082/files/13108081644.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/bilab.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/7902029485.pdf
    • https://cdn.shopify.com/s/files/1/0432/9065/6924/files/97236000197.pdf
    • https://cdn.shopify.com/s/files/1/0438/3594/9218/files/vezadumevusujirila.pdf
    • https://cdn.shopify.com/s/files/1/0431/3559/8758/files/ralirifir.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/wulawe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/68973839187.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_off000070d9.bin
9a52420f7243dc1b545866297f6b3f084f03edc86e351bdb4c3a7f14ceefd8ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D9 5348 bytes
font_01_sfnt_off0000831b.bin
9f88460765f7f5596781188b734e9ea32fcd34554bd9ba68713d25a9dd9777cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x831B 10532 bytes

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