Malicious PDF — malware analysis report

Static analysis result for SHA-256 56049c75827bf58d…

MALICIOUS

PDF

48.2 KB Created: 2020-08-14 00:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd894001aca53e63ae10255488bcac0c SHA-1: 8c6d7994afac39c6c3fd959b30daabeed5289248 SHA-256: 56049c75827bf58d734baccddafbe96172dd26e92c30f65038cdbe256ac65fe7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wb?keyword=python%20language%20pdf%20book'. Additionally, it features a PDF link farm with numerous links, many hosted on cdn.shopify.com, suggesting an attempt to game search engines or distribute content. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the presence of malicious redirector links and the link farm indicates a likely phishing or malware distribution attempt.

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=python%20language%20pdf%20book
    • http://files.maggieknaus.com/uploads/1/3/1/4/131455956/mikokovasirufo-nevud-lirib.pdf
    • http://lasovo.harmonizeyourhealth.info/uploads/1/3/2/6/132696323/35a062b4bd69ce.pdf
    • http://files.kalyango.com/uploads/1/3/0/7/130740264/3708491b9acf01.pdf
    • http://tefaf.joannbruhn.com/uploads/1/3/1/3/131383483/8825900.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8213/files/95443933112.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/artificial_intelligence_full_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7217/files/69018033969.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/78._8_kg_to_lbs.pdf
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/dojumaxejikunuwofa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/mastering_bitcoin_unlocking_digital_cryptocurrencies_download.pdf
    • https://cdn.shopify.com/s/files/1/0448/2406/8258/files/blood_test_types_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/13625080969.pdf
    • https://cdn.shopify.com/s/files/1/0436/2492/3298/files/carbazole_synthesis.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/33144656675.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/how_to_make_discord_louder.pdf
    • https://cdn.shopify.com/s/files/1/0440/7066/6392/files/53442834569.pdf
    • https://cdn.shopify.com/s/files/1/0428/6644/2406/files/pukilizitisawixavaja.pdf
    • https://cdn.shopify.com/s/files/1/0449/8564/7272/files/abordagem_triangular.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_off00007f81.bin
1d3c63dbf1485e2b8a4d777f1299f2e6697b0aac05032bc1b7f020d0aae80489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F81 5336 bytes
font_01_sfnt_off000091a8.bin
384637b542e722866cc0d3d8f566e0616c1f37ec0826d62b711f14d8d7e060ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91A8 10080 bytes

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