Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb77176fe2a757c…

MALICIOUS

PDF

47.8 KB Created: 2020-08-18 17:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de1f58c9a5f7fff7cb663175b3b83bd9 SHA-1: 4625b5d66a0944f0f18e274bbd77ed2062ad203a SHA-256: 7cb77176fe2a757c35ef478e6e7ad3503cf4bd4b950ce5305ff66283ac74d229
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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=bike+race+apk+all+bikes+unlocked
    • http://files.rachelawallis.com/uploads/1/3/2/6/132695862/nuguzubaj.pdf
    • http://files.mobile-massage-sydney.com/uploads/1/3/1/4/131406749/5d4c81.pdf
    • http://files.danaavant.com/uploads/1/3/0/7/130775746/3375008.pdf
    • http://fepefat.southlyoneastdrama.com/uploads/1/3/2/7/132710700/bedudifud-fubamuluwatal-kokezepodijo.pdf
    • http://bazejid.abteendrivingacademy.com/uploads/1/3/0/8/130813528/8784126.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/cathodic_protection_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/maworilebewelawukenimid.pdf
    • https://cdn.shopify.com/s/files/1/0428/3177/3852/files/beginner_level_english.pdf
    • https://cdn.shopify.com/s/files/1/0459/9663/8365/files/lugenixusa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5919/files/fezewujuduxurexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/56798725411.pdf
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/97179005951.pdf
    • https://cdn.shopify.com/s/files/1/0433/8312/8214/files/37110997436.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2480/files/68462077563.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31906594002.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/gabedepoligerifer.pdf
    • https://cdn.shopify.com/s/files/1/0437/6182/8001/files/50549213376.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_off00006712.bin
f0a3210a7df25704a48865ea950694799f4bbc174444400f5ba0b0eddb80ef16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6712 5320 bytes
font_01_sfnt_off00007925.bin
7e0ae0b9f69ec0d3aafc7eddcd30904eb9cc6c31a8574695448d0792885a11e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7925 10248 bytes
font_02_sfnt_off00009c83.bin
53c3ec829963ec5a0af1bff4be2d724acb9959b277e5253d769434e6be684fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C83 16160 bytes

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