Malicious PDF — malware analysis report

Static analysis result for SHA-256 8290b8b3631ca5ef…

MALICIOUS

PDF

46.7 KB Created: 2020-07-22 23:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd6fabd3c179e4358cfdd4f0984845c6 SHA-1: e04461f6538107db280f24a9f30d144dc78d75b8 SHA-256: 8290b8b3631ca5ef7c45a7374e4e9bbd808f7d5d2ca38cd0d6d49d9bcea83bc7
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. Additionally, it exhibits a PDF link farm, with numerous embedded URLs pointing to Shopify domains, likely for SEO poisoning or to host further malicious content. The ML classifier also strongly flagged this PDF as malicious. 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/wb?keyword=fractura%20de%20cadera%20traumatologia%20pdf
    • http://files.mmeramirez.com/uploads/1/3/0/9/130969655/matodikajusuze-dabidox-kosaluzikeso-vanejamedopezug.pdf
    • http://files.befitforhealth.com/uploads/1/3/1/1/131164383/4740807.pdf
    • http://files.kingsporthorses.com/uploads/1/3/1/3/131383553/1742861.pdf
    • http://files.advancedmodularmanikin.com/uploads/1/3/1/8/131856353/b322085aedb061c.pdf
    • http://files.thinkingwithcrystal.com/uploads/1/3/1/0/131070762/vasikasu.pdf
    • http://files.kingsporthorses.com
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muzaloxebomasu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/57395631616.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/45891301022.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/faramerujinusopuko.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/50839239327.pdf
    • https://ragetefuka.files.wordpress.com/2020/07/paloki.pdf
    • https://lapojiruvapo.files.wordpress.com/2020/07/zalodu.pdf
    • https://kuduwefego.files.wordpress.com/2020/07/mavoriduxikomudijasane.pdf
    • https://rizizesul.files.wordpress.com/2020/07/87395991861.pdf
    • https://cdn.shopify.com/s/files/1/0438/3368/8226/files/lolizisifokenirozugadifu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1869/files/joder.pdf
    • https://cdn.shopify.com/s/files/1/0428/6716/3302/files/75463920652.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/87530303441.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/81989125983.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/dozuroxofopotazelo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4081/5774/files/pexumuzobive.pdf
    • https://cdn.shopify.com/s/files/1/0430/6052/7265/files/gubodo.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_off00007697.bin
f58dc88fa61c5e47fbd391d44cf4e0d9c3f51354df6e9423ae93d715337438a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7697 5028 bytes
font_01_sfnt_off000087b7.bin
5f22c975c80667764d51998d2fb83025e67f37b2c79c498001408d3c573e360c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87B7 11012 bytes

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