Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a245f6fa0b63b34…

MALICIOUS

PDF

121.3 KB Created: 2020-08-06 22:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3ca730daaff0a72e63fd44039c6c6bb SHA-1: 323fe829ff39d59b4fc2a949395b6aaaa59c7484 SHA-256: 0a245f6fa0b63b34d847c7d63c06d7418cdfe25661a9cd6a613145c5c6b1ad1a
194 Risk Score

Malware Insights

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

The sample is a PDF document that contains a link to a known malicious redirector, identified as a critical heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of an advance-fee scam lure. The presence of numerous PDF links, many pointing to benign Shopify domains, suggests a link farm or SEO manipulation tactic to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.com/wb?keyword=ipcc%20first%20assessment%20report%20pdf
    • http://files.allmatters.net/uploads/1/3/2/6/132683267/302339d04672d.pdf
    • http://files.alicefernandes.com/uploads/1/3/0/8/130874108/gisewelexukimape.pdf
    • http://files.westmichiganglsi.org/uploads/1/3/1/4/131409693/234170.pdf
    • https:///www.ipcc.ch/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4256/9383/files/jofotudekanujus.pdf
    • https://cdn.shopify.com/s/files/1/0436/8151/3622/files/novivajogataradejajoze.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/48658070216.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66456909559.pdf
    • https://cdn.shopify.com/s/files/1/0431/4044/8410/files/best_book_for_spring_framework.pdf
    • https://cdn.shopify.com/s/files/1/0432/2197/5197/files/73890459302.pdf
    • https://cdn.shopify.com/s/files/1/0432/3147/7922/files/javoxanivijab.pdf
    • https://cdn.shopify.com/s/files/1/0439/5565/0718/files/moxepusanelivizikukadowoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4069/files/dikox.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/17099481477.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vakijuxek.pdf
    • https://cdn.shopify.com/s/files/1/0429/7742/7609/files/46625029252.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9173/files/timer_for_2_min.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/rabubezipaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/6863/7862/files/nesumidixi.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_off00019c8e.bin
4536057a404402b8ce156bb02333c212835ae71b5af8146e98620774a84cb751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19C8E 5208 bytes
font_01_sfnt_off0001ae2e.bin
fbed889bc4b371b263a655bc2c2b0fcd2d4371540a3bb9aab4da80b69f35e89b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE2E 12700 bytes

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