Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4db9a09fb35e53f…

MALICIOUS

PDF

35.5 KB Created: 2020-08-12 02:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 159e9ec2e49eb84840d96f659a68ca06 SHA-1: 38254363dee7e6b1ee7686a7f207ec6279b99fe2 SHA-256: f4db9a09fb35e53fd4a13724463b75edc31887c6dc38cf19a8d59ed9b149a233
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign Shopify URLs, but crucially includes a link to a known malicious redirector. This redirector is likely used to obscure the final malicious destination, which is a common tactic for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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=practical+mathematical+optimization+pdf
    • http://files.trudietrewin.com/uploads/1/3/0/7/130775730/xurof.pdf
    • http://files.beccarothfeld.com/uploads/1/3/0/8/130874326/20e7cfe6.pdf
    • http://files.beyondletterpress.com/uploads/1/3/1/4/131407406/dugorabiwosig_mukabadixamed_jadex.pdf
    • http://files.mwri.co/uploads/1/3/1/4/131437983/c7cf21e3cf3562.pdf
    • http://files.guybedfordleather.com/uploads/1/3/1/4/131407493/2264285.pdf
    • https://cdn.shopify.com/s/files/1/0437/6150/0309/files/86806736435.pdf
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/android_app_inventor_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/desastre_de_chernobyl_resumen.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/tikomotovenegekowixobu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8275/1893/files/6262615377.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3022/files/stet_bihar_previous_year_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/bupovik.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7174/files/kikewusuvipolifamuxapem.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/lagajowup.pdf
    • https://cdn.shopify.com/s/files/1/0435/8239/0431/files/cable_tie_sizes.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/anatomy_and_physiology_for_nurses_roger_watson.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/tigomepiviveteziv.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/kujake.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/cock_and_ball_torture_pornhub.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_off00004f49.bin
30fbe18905e20427b7564ba815702a338ee151297acea9f15f867b7dfec45536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F49 5268 bytes
font_01_sfnt_off00006106.bin
f871b420c94760fceb253389ef4865d0e65ce29a0cbff27fd843c8affb317cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6106 9312 bytes

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