Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6382f212448b87…

MALICIOUS

PDF

39.4 KB Created: 2020-08-31 12:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9f7553bbf4282235874e2b04b761674 SHA-1: 2e360ff4f010f75feb504fd252584a4d07d2498f SHA-256: ef6382f212448b87ff41d2e69691a11295685f0efa929619e6663df59e992791
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to Shopify domains hosting other PDFs. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The presence of a large link farm suggests an attempt to game search engine results or distribute malicious content through seemingly benign PDF files. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the direct user-facing lure.

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/wix?keyword=skullcandy+uproar+wireless+driver
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/ganazipigosatuzazifip.pdf
    • https://cdn.shopify.com/s/files/1/0470/6477/6872/files/venawanixisogosus.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0378/files/contending_forces.pdf
    • https://cdn.shopify.com/s/files/1/0437/1618/2184/files/duvubidatudales.pdf
    • https://cdn.shopify.com/s/files/1/0440/7872/7318/files/perifuli.pdf
    • https://cdn.shopify.com/s/files/1/0437/9518/5824/files/valentine_day_date_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/1984/4258/files/69070654095.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8593/files/61671513324.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/jagurewa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4613/2119/files/46302079801.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18491093394.pdf
    • https://cdn.shopify.com/s/files/1/0432/8708/5220/files/deped_detailed_lesson_plan_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/math_worksheets_for_rounding.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8741/files/kung_fu_panda_1_movie_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0057/files/78900866824.pdf
    • https://cdn.shopify.com/s/files/1/0431/7370/7925/files/security_awareness_training_program.pdf
    • https://cdn.shopify.com/s/files/1/0430/8906/8185/files/datetimepicker_format_dd_mm_yyyy.pdf
    • https://cdn.shopify.com/s/files/1/0451/6803/3946/files/dibujarte_libro_1.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_off000052c3.bin
61e967e4fc744327f3a9f7dba9bcde468b31420f9c2460156ccfe483c49bf415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52C3 5488 bytes
font_01_sfnt_off00006592.bin
b50a0d06c38215563bc30fc618e30836e7339baf50ca7df84a0f444accf52fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6592 14380 bytes

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