Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e327f7c93819d5…

MALICIOUS

PDF

55.0 KB Created: 2020-07-31 01:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cebcb26c873963600124c62c1bb7c754 SHA-1: 4f2756966931e8c112641b404fa0b89c102083be SHA-256: 12e327f7c93819d52a7d6f7973de623295ea5df1e366896149f86642eaab692f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains numerous links to external resources, masquerading as search results for a technical book, which is a common lure for advance-fee scams. One of the embedded URLs, 'https://ttraff.com/pify?keyword=goodrich+tamassia+data+structures+and+algorithms+in+java+pdf', is flagged as a malicious redirector. 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.
  • 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/pify?keyword=goodrich+tamassia+data+structures+and+algorithms+in+java+pdf
    • http://files.rexforddrive.com/uploads/1/3/0/8/130873965/13eddb8f9590e5.pdf
    • http://files.atlantikwall-museum.nl/uploads/1/3/0/8/130873921/bavofunopaza.pdf
    • http://files.wannabenomad.com/uploads/1/3/1/6/131606546/9856145.pdf
    • http://files.nethertonmontessori.com/uploads/1/3/1/3/131384663/mivizimimanawo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/71999083138.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/20662697952.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/budewudaxolid.pdf
    • https://cdn.shopify.com/s/files/1/0435/8527/4024/files/togikage.pdf
    • https://cdn.shopify.com/s/files/1/0433/6041/9989/files/81413896510.pdf
    • https://cdn.shopify.com/s/files/1/0432/4527/3248/files/makob.pdf
    • https://cdn.shopify.com/s/files/1/0434/0862/1735/files/84807166815.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5539/files/60581235752.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/gitewukef.pdf
    • https://cdn.shopify.com/s/files/1/0440/6280/2070/files/wazadelagukujixuxilelevot.pdf
    • https://cdn.shopify.com/s/files/1/0433/8958/3514/files/beman.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54748680829.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/13940123217.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/5000/files/20197549266.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_off000082c1.bin
5c720dc19137936104b5eb5c970177942ef6587af391c63fabcf75f0a815e704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C1 5620 bytes
font_01_sfnt_off000095cd.bin
a348e4439a66259a3b52201ac1ae0620ea657b79acf361337485bcd25c7181da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95CD 10144 bytes
font_02_sfnt_off0000b876.bin
9c0b324cb00f432843e7bf6aa6681d4ee1950797a85fd697fe0bc8b121e8710a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB876 16084 bytes

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