Malicious PDF — malware analysis report

Static analysis result for SHA-256 60ef7935b253b33c…

MALICIOUS

PDF

46.7 KB Created: 2020-08-13 04:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70ceb9cdca55632cd257355160ed8310 SHA-1: ee4e162ddd63b988ed0c611b9ad06813bd5343bc SHA-256: 60ef7935b253b33c1dd2a7c80496d9c657243c27666a5c3c251d9077bddba192
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to manipulate search engine results, with one prominent link leading to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious infrastructure, likely for phishing or malware distribution.

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=spelling+bee+words+for+grade+2+pdf
    • http://kofisal.troop76losaltos.com/uploads/1/3/0/7/130776873/fedojepazopupaveje.pdf
    • http://files.madebyloulou.net/uploads/1/3/1/8/131871891/59bfb6ba928ffb6.pdf
    • http://files.hypopara-australia.com/uploads/1/3/1/4/131438459/886b42eee4da5.pdf
    • http://totin.queenscosmetics.org/uploads/1/3/1/3/131384281/10d666e67c.pdf
    • http://zezosez.deceptivapparel.com/uploads/1/3/0/7/130776394/3537823.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1895/1576/files/walmart_w2_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/7931/0239/files/gudevupusubanebat.pdf
    • https://cdn.shopify.com/s/files/1/0437/5196/4830/files/94195624387.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/debbie_harry_face_it.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/26740215355.pdf
    • https://cdn.shopify.com/s/files/1/0439/1573/9304/files/formater_windows_8._1.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/35901448853.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/adb_sideload_twrp.pdf
    • https://cdn.shopify.com/s/files/1/0434/5033/5384/files/jufemunokejopogevofogika.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5013/files/kupekafedutala.pdf
    • https://cdn.shopify.com/s/files/1/0431/8203/1007/files/tinexulorilinoranuzexij.pdf
    • https://cdn.shopify.com/s/files/1/0439/3828/3678/files/cane_s_menu.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_off00006edf.bin
c382c06de9b5bce7a1f278f0f1b2452cd8dc6976a026d357b5d4376694016904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDF 5676 bytes
font_01_sfnt_off00008244.bin
2a09c0bccf25b769ec9346c9e129dde938c81c5a3ce6d223f3150df4d45bde02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8244 13516 bytes

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