Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc855f24a162314…

MALICIOUS

PDF

40.9 KB Created: 2020-08-07 10:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2a528ca2c8b452c430b31238c69f09f SHA-1: 8794d4f1a32e3b55079f8eb7540f092ef121b736 SHA-256: fcc855f24a1623145b4d56649975328440688dd6a1003fec16a8025b0f924faf
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 URLs, many of which are part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body itself contains obfuscated text and URLs, including the primary malicious redirector URL.

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=doing+bayesian+analysis+pdf
    • http://files.theartplacestudio.com/uploads/1/3/0/8/130874396/9a577.pdf
    • http://files.ncscammers.com/uploads/1/3/0/7/130775484/gubuvepe.pdf
    • http://files.sactownappraisals.com/uploads/1/3/1/6/131637016/abb9a0817ed468.pdf
    • http://files.adimef.com/uploads/1/3/1/4/131453241/wirepizomazuvim.pdf
    • http://files.localeyeonline.com/uploads/1/3/1/3/131383892/pivaxoxakoderiv-lekorawu-rijelib-zetaxowafut.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/xebukuneximefi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6759/files/runokete.pdf
    • https://cdn.shopify.com/s/files/1/0433/7795/0881/files/12792466410.pdf
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/fomipuxopopadilito.pdf
    • https://cdn.shopify.com/s/files/1/0434/5341/5576/files/core_clinical_cases_questions_and_answers_in_medical_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/losetuvasafujibebo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/34927921494.pdf
    • https://cdn.shopify.com/s/files/1/0439/9860/9566/files/seventh_day_adventist_meal_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0117/files/reliwanipuxizewumetetop.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/25447553264.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0339/files/marxisme_untuk_pemula.pdf
    • https://cdn.shopify.com/s/files/1/0432/2479/3245/files/7858431902.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_off000061a3.bin
fe56451a6423625b8b5838094653d928d270983779dda7ffe55dd834474b6aef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A3 5352 bytes
font_01_sfnt_off000073fb.bin
e2235abdd183388357b1ea678a84b92429893a7982782adada63d1565c5fbfe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FB 10228 bytes

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