Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24f7616b0bf18d3…

MALICIOUS

PDF

44.3 KB Created: 2020-08-10 18:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f7ea65c2cd76d71d942b40851e94d1 SHA-1: 3b8067fcf205888066b4eb4f20541a14ae80e4d5 SHA-256: f24f7616b0bf18d311d4d7fe370a0b74e7481dee9d9203efc3b7c15e894d5fe1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to external resources, which is indicative of a link farm or SEO spamming technique. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.com), suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern involves directing users to potentially harmful external sites.

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.com/pify?keyword=political+map+of+south+africa+pdf
    • http://files.belennalauto.com/uploads/1/3/2/6/132682676/bc7c1974d.pdf
    • http://fufenun.playleadguitar.net/uploads/1/3/0/7/130775735/mifixavimi.pdf
    • http://files.pegasuscreationscandlecandyshop.com/uploads/1/3/0/9/130969543/baxekad_zanasiwas.pdf
    • https://cdn.shopify.com/s/files/1/0432/7591/1321/files/pomudawokebapufake.pdf
    • https://cdn.shopify.com/s/files/1/0431/4716/5850/files/97953087190.pdf
    • https://cdn.shopify.com/s/files/1/0429/8270/3257/files/cerebral_contusion.pdf
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/geniwukew.pdf
    • https://cdn.shopify.com/s/files/1/0440/5785/4102/files/add_subtract_fractions.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1641/files/kirupotimuxatazu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/revoworezafazuku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8534/0580/files/65091910440.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nudukesobiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/solid_liquid_gas_worksheet_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/sibug.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/16938535414.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/bitove.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_off00006f11.bin
1670f6bc2a41f6d7eb569318e744a615aed5b018f24c886b65891a80f0787488
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F11 5396 bytes
font_01_sfnt_off00008142.bin
4b1fb06c2aab5450dc5e3906883b61300fd49b02df97b94987f870c708b76426
pdf-font-stream PDF embedded font (sfnt) at offset 0x8142 10264 bytes