Malicious PDF — malware analysis report

Static analysis result for SHA-256 02af67c2ed29cb09…

MALICIOUS

PDF

54.1 KB Created: 2020-08-15 06:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7620de6005ecf537c236f869d8588de SHA-1: 8346a4f8cf6f8127dd712ccea8780754e91a5b80 SHA-256: 02af67c2ed29cb09009d4b96e52ededbaf44f1f2c6664189d1b8e21cc5734ff6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=non+verbal+reasoning+analogy+pdf`. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated but contains the same redirector 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=non+verbal+reasoning+analogy+pdf
    • http://files.conklinstudiopottery.com/uploads/1/3/0/7/130776602/9e45c877b0641.pdf
    • http://fefovebo.msqg.org/uploads/1/3/1/4/131438641/nexuz_nokidep_xopavaj_xiwizamu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/sofevekipuxoda.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/76150416654.pdf
    • https://cdn.shopify.com/s/files/1/0450/3732/2390/files/wakivebewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5754/4342/files/livasesereseli.pdf
    • https://cdn.shopify.com/s/files/1/0430/9221/3911/files/raxosukimemozun.pdf
    • https://cdn.shopify.com/s/files/1/0434/3100/2269/files/barron_s_sat_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pexigubozorabavajodumixi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/career_paths_medical_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/foxixupofofudi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5388/3293/files/95079136644.pdf
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/jixeru.pdf
    • https://cdn.shopify.com/s/files/1/0440/0028/0734/files/beroweb.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/60369045039.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078ce.bin
e7944d6a64af5bcd794737bd480f5be8e32ab92baa156ae22ec1ac64df0de8a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CE 5480 bytes
font_01_sfnt_off00008b83.bin
a00953ad6829e1ac36333267e8042df4d545bd50285543c5e0ee35811431bd57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B83 13276 bytes
font_02_sfnt_off0000b66d.bin
c46167c1537ace1c34328017dc45fc1565d7348f0e5575c4b229e9a9e973acaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB66D 16112 bytes

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