Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f38db5283ed213…

MALICIOUS

PDF

55.0 KB Created: 2020-08-12 13:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9839bd265f13e9071464691ad542a39 SHA-1: cb6a3bce5ad960e1e03cdaa98905751078fb3c93 SHA-256: 85f38db5283ed213d1e3006c8551e3b84db8cf9e5b6a4143b115b3212df5fd74
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to what appears to be a link farm designed to improve search engine rankings. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=edit+pdf+free+mac+os'. This suggests the document is designed to trick users into clicking malicious links, likely leading to further compromise. The ML classifier also strongly indicated maliciousness.

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=edit+pdf+free+mac+os
    • http://files.patriciahelderministries.com/uploads/1/3/0/9/130969772/8954857.pdf
    • http://tezibelol.bettereatingcoach.com/uploads/1/3/1/3/131379246/fopova.pdf
    • http://zataredig.bexartspe.org/uploads/1/3/2/7/132710657/1513662.pdf
    • http://files.wepnerwellnesstherapy.com/uploads/1/3/1/1/131164394/5921996.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8548/6485/files/wotetudibosivumosoxawomu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8911/4789/files/mathematical_induction_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4839/files/9108256505.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/detukotunobilowidobutos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0746/6916/files/10179649889.pdf
    • https://cdn.shopify.com/s/files/1/0432/5005/7373/files/toronto_alexithymia_scale_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/74716198376.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/tips_for_happy_life.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8359/files/skyrim_se_npc_overhaul.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/9739996449.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37144816260.pdf
    • https://cdn.shopify.com/s/files/1/0429/0949/9551/files/43279836115.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8541/files/builders_square_method_of_setting_out.pdf
    • https://cdn.shopify.com/s/files/1/0436/7125/7241/files/triangle_classification_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f67.bin
6f6c5a8fb5e62cfd2b6ff76f758e0f05a98695d5bac735cd019a42cb5e5649ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F67 2952 bytes
font_01_sfnt_off000099f4.bin
3940a97e8411687ada14ecd79d1ec2f1ffc7cdea2d5868114214e21b08ea7910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99F4 5228 bytes
font_02_sfnt_off0000aba1.bin
c6b4f16a7900b99cd611dd32fcd3f0f6d377961fc32bedca0bd189283595f9a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABA1 10308 bytes

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