Malicious PDF — malware analysis report

Static analysis result for SHA-256 826aaaba82598ea7…

MALICIOUS

PDF

107.0 KB Created: 2020-08-06 10:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b29d645d87676e7a40b8a0b5b6b6cbe SHA-1: 52be300c2130d7ef2aa0d5fa541b00c12b78c552 SHA-256: 826aaaba82598ea744a792d3f842afb3420fc4136003906aa777bd061f9b21c1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The primary URL, https://ttraff.ru/pify?keyword=guia+ceneval+ingenieria+industrial+pdf, is flagged as malicious. The document body, though heavily obfuscated, contains similar URL patterns, suggesting an attempt to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=guia+ceneval+ingenieria+industrial+pdf
    • http://files.robinsonpainting.net/uploads/1/3/2/6/132695302/9706931.pdf
    • http://files.misfitcrusaders.com/uploads/1/3/0/8/130814672/634f8e.pdf
    • http://files.hairbyhkt.com/uploads/1/3/0/7/130776225/wuxagerejixew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0055/1830/files/blackjack_game_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/rulipexelujoraruk.pdf
    • https://cdn.shopify.com/s/files/1/0431/6561/4234/files/96910279445.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/bulomobaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/1615/0427/files/xoxizemofi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/nukelufajogirupixomo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/moluwoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/3319/8745/files/semuvanabuwozelur.pdf
    • https://cdn.shopify.com/s/files/1/0433/7752/4888/files/60916545726.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/davutazesisepokuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/14153914499.pdf
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/sozenap.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_off00016795.bin
e5f4507acd7541fcd2185b27d0fed28a895b3b28fadb639926ae422a2708f203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16795 5416 bytes
font_01_sfnt_off00017a1d.bin
f65ef7b59529b56d8805f7e0c877fa0818917561d867f4d2d66f12cb852d4593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A1D 10704 bytes

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