Malicious PDF — malware analysis report

Static analysis result for SHA-256 107793228b0ac0ae…

MALICIOUS

PDF

42.0 KB Created: 2020-08-01 14:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afa0d9a173846081da2d75b0785e1cdf SHA-1: 82a5f0ec6ec42c337d01f81ca52b2aab3e6d0ff3 SHA-256: 107793228b0ac0aeecbe8f0bc96200383db20f3d6b0b33eb02f1b238837cf247
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious link identified is https://ttraff.cc/pify?keyword=factorio+5+to+4+balancer, which is known to lead to malicious content. The document body, though heavily obfuscated, contains references to 'Factorio 5 to 4 balancer', suggesting a lure to attract users interested in that topic. The ML classifier also strongly indicated maliciousness.

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=factorio+5+to+4+balancer
    • http://files.withvsat.com/uploads/1/3/1/4/131452823/kafevena_vojixozowes_misirisukowose.pdf
    • http://files.odensymposium.org/uploads/1/3/1/3/131383318/c94df407b75.pdf
    • http://files.get2knowisi.org/uploads/1/3/0/7/130775002/jasofisijifeliragelo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/99991931636.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6707/files/99885968412.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2503/files/fofusiwep.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6818/files/58739257517.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3291/files/tuzunudem.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/wamupuzuxezufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/352770276.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3267/files/90289247061.pdf
    • https://cdn.shopify.com/s/files/1/0434/0813/0213/files/25168684913.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/10273532643.pdf
    • https://cdn.shopify.com/s/files/1/0437/2925/6613/files/61293136523.pdf
    • https://cdn.shopify.com/s/files/1/0436/3039/5552/files/96616056876.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_off00006739.bin
a5348a472884b9043b54b897cf451d9479bdd2efb184c59568d692b2173b03ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x6739 4920 bytes
font_01_sfnt_off00007812.bin
e9c99de2adb4bcbcec9001ec70f183590a694f0d66db291d2f99586fbdb39ea1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7812 10372 bytes