Malicious PDF — malware analysis report

Static analysis result for SHA-256 431502025dea5570…

MALICIOUS

PDF

47.2 KB Created: 2020-07-28 17:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e34010ba5976930dc45e6dbbe174a54 SHA-1: 3e12a233c83436f5e8166c2ae6b07a9a0914e97f SHA-256: 431502025dea55700493f997497b6818c93d7995c47f29a7c4f434236de4bee2
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common technique for delivering malicious payloads or phishing pages. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to known malicious infrastructure and for containing a link farm. The document body, though heavily obfuscated, appears to contain keywords related to the lure. The primary IOC is the redirector URL, which likely leads to the next stage of the attack.

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=osha+lock+out+tag+out+quiz+answers
    • http://files.azioshsfi.org/uploads/1/3/1/4/131406717/6645582.pdf
    • http://files.dwaynekickszombiebutt.com/uploads/1/3/1/4/131405977/3146969.pdf
    • http://files.creativewebsites4you.com/uploads/1/3/1/8/131860938/021e96920bf9ab.pdf
    • http://files.plumblossomtaichi.ca/uploads/1/3/2/7/132740778/4504037.pdf
    • http://files.clearwatermusicserves.com/uploads/1/3/0/7/130739183/6ce1fb3d15650b1.pdf
    • https://cdn.shopify.com/s/files/1/0439/1596/8667/files/viwalu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/64580818191.pdf
    • https://cdn.shopify.com/s/files/1/0438/6275/3445/files/todaruduvo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7529/files/25759070866.pdf
    • https://cdn.shopify.com/s/files/1/0432/3039/6574/files/2444947751.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xubeke.pdf
    • https://cdn.shopify.com/s/files/1/0431/6050/2421/files/36780926746.pdf
    • https://cdn.shopify.com/s/files/1/0439/2304/6568/files/90144966171.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/1120219583.pdf
    • https://cdn.shopify.com/s/files/1/0434/0524/6631/files/wotazasex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4179/files/4714909751.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/sudumeforukejopijeda.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/62801603665.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/
    • https://cdn.shopify.com/s/files

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bd1.bin
f44306b754f036e7d8dfa585d9dd90deebdc5ec05e8f8aab19e09b4301b31262		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD1 5304 bytes
font_01_sfnt_off00008de4.bin
d104e39a7eda96f8516a2a9f8b53d83ee71f54a955a9669e876f5207f674e85f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE4 9824 bytes

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