Malicious PDF — malware analysis report

Static analysis result for SHA-256 438b294390121e10…

MALICIOUS

PDF

45.6 KB Created: 2020-08-10 13:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30a4f6cbc51c6dcef699f17d0f77489d SHA-1: 85b602fa7d171701d00a69779da395e3a481e7ff SHA-256: 438b294390121e1036e576a9ed8b8e0316c2c5fe55d224eee3c6a1efc1115ea7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/pify?keyword=celta+assignment+1+pdf', points to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of many external links suggests a link farm or redirection scheme designed to lead users to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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.ru/pify?keyword=celta+assignment+1+pdf
    • http://lugot.dycaaup.org/uploads/1/3/2/7/132710621/nokabufadobuwuluwule.pdf
    • http://files.caddisshackguideservice.com/uploads/1/3/2/6/132695586/4558637.pdf
    • http://files.michiganbowhunters.com/uploads/1/3/2/6/132682966/6547291.pdf
    • http://files.bestdealvacations.com/uploads/1/3/0/7/130740442/6441455.pdf
    • http://files.oaroutdoor.com/uploads/1/3/1/4/131454221/dufubovarededonilez.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/avani_avittam_mantras_in_tamil_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26160609228.pdf
    • https://cdn.shopify.com/s/files/1/0433/6123/9192/files/recuento_de_enterobacterias.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/ralizi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/49782607555.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/48621199467.pdf
    • https://cdn.shopify.com/s/files/1/0440/8537/9237/files/11896553063.pdf
    • https://cdn.shopify.com/s/files/1/0434/7366/6213/files/35309646602.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/cessna_172_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/bloom_s_taxonomy_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/73479114073.pdf
    • https://cdn.shopify.com/s/files/1/0446/7389/2515/files/five_stages_of_grieving.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_off00007498.bin
d785874ab0751e005b6abac59875ef291233af6c2626c777119acda4cfacc437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7498 5224 bytes
font_01_sfnt_off00008653.bin
a42620f4a684dea41a8ffda5ab5e256d7c65aea5e50dad404321d4f697b9a5aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8653 10392 bytes

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