Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d33a552ce9cd7cc…

MALICIOUS

PDF

43.9 KB Created: 2020-08-01 22:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 517c57fa0b7497833f1d86cce9de499f SHA-1: 841655fd8a981b3345f1bc1e640c4b81cc6e13e9 SHA-256: 7d33a552ce9cd7cc6f10b16744dd0ee77252e15c5853e60855a6ec6e0af42163
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a link farm or phishing attempt disguised as a Ski-Doo owners manual. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports this assessment. The document body itself is heavily obfuscated but contains the primary malicious URL.

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=ski+doo+owners+manual+pdf
    • http://files.aoseptic.com/uploads/1/3/0/8/130815140/simasilerege.pdf
    • http://files.grettawilson.com/uploads/1/3/1/4/131437351/5306487.pdf
    • http://files.kingramseysbitters.com/uploads/1/3/2/8/132815154/4914257.pdf
    • http://files.bsocial.co.nz/uploads/1/3/0/7/130740196/4704211.pdf
    • http://files.carolinastormhedgehogs.com/uploads/1/3/1/6/131637291/fanipewonosewagafuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/wotuxeberepafizixojev.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/36217261453.pdf
    • https://cdn.shopify.com/s/files/1/0440/8141/4296/files/13719203680.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/63173553537.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0471/files/golidodifenop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7450/files/9890293030.pdf
    • https://cdn.shopify.com/s/files/1/0436/2531/6514/files/dasajejujafagujojatira.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/segupeperazovubovoliluv.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/sasozafudi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/wemumuwowolumagukexeso.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/64252445540.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/jokofelabevedixux.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_off0000678f.bin
d7ddb4fd094a960937b799d243129083c6d50d745d9d26409ea8f0797f6a79c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678F 5448 bytes
font_01_sfnt_off00007a13.bin
a1c2b3609feaa352b1c09cfb3a456594959828eae3b9b9bb0481e99191425355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A13 12896 bytes

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