Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d2e502dd71a21c…

MALICIOUS

PDF

39.2 KB Created: 2020-08-28 06:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 206a1ab88d1e8fd9a4667a8ca3040e1c SHA-1: a6e634f9190d71583503d2359a9eb4aa3870b49c SHA-256: 50d2e502dd71a21cfa495be4810a44a1748bdad305ce95b26f8c01216c570c31
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a high number of embedded links, many of which point to external PDF files. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. The document body contains garbled text but also includes the same malicious URL, suggesting a lure to a potentially harmful site. The presence of numerous external links, including the redirector, indicates a likely SEO poisoning or redirection attack.

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=savage+axis+parts
    • http://rexeji.purduebap.org/uploads/1/3/2/8/132816066/93da0485.pdf
    • http://files.gotothestation.com/uploads/1/3/0/8/130814682/0dfa8e2082813.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2520/files/12640921383.pdf
    • https://cdn.shopify.com/s/files/1/0436/5654/4409/files/possessive_adjectives_exercises_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0430/8244/9045/files/2012_vw_passat_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8478/3509/files/15065726459.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/80058759164.pdf
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/69366611535.pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/development_plan_for_work_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/viganib.pdf
    • https://cdn.shopify.com/s/files/1/0437/7778/6018/files/nivujonuvefusakidunuju.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/joxuka.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6797/files/structure_and_function_of_aquatic_ecosystem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f0b.bin
abd4e9b4b897c3e3666f4c46a69f8d0f35c710f9e2836d1b41a73789c75da726
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F0B 4756 bytes
font_01_sfnt_off00005f4e.bin
bdab4efdfa83fe21799d55c0a73ab02a328d1e57337c255d442cbac7e0eb46c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4E 10228 bytes
font_02_sfnt_off0000823f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x823F 4324 bytes