Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e479c8b5688657…

MALICIOUS

PDF

42.5 KB Created: 2020-07-31 20:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f06eb025e7ccf0c9f54bf68e279e6d6 SHA-1: db5e6d22a2992a776611bf3413044bdf62ccb01f SHA-256: 18e479c8b5688657cb9026d969ec7958b02d4da57badbcf3981c137eac0326a7
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, 'https://ttraff.ru/pify?keyword=frontend+developer+jobs', is flagged as a known malicious redirector. The document body, though partially corrupted, suggests a lure related to 'frontend developer jobs'. The presence of numerous links and the malicious redirector indicate an attempt to lead users to potentially harmful content.

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=frontend+developer+jobs
    • http://files.susanparrpoetry.com/uploads/1/3/1/1/131164130/85c80ae2bdee.pdf
    • http://files.kupcakesagogo.com/uploads/1/3/2/7/132712005/danunam-dimijepamig.pdf
    • http://files.rebeccafiorentino.com/uploads/1/3/1/3/131398242/tibesenupemokot.pdf
    • http://files.ghostwrittensomniloquy.com/uploads/1/3/1/3/131379830/caf3b18ff.pdf
    • http://files.hotstuffnmore.com/uploads/1/3/1/4/131437636/8279407.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/gopanuzoje.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6669/files/gogop.pdf
    • https://cdn.shopify.com/s/files/1/0431/3248/5793/files/82242302214.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/22119848292.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/36169716167.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1369/files/sikirigabad.pdf
    • https://cdn.shopify.com/s/files/1/0434/7605/8274/files/zavetuxezumopujabilogavi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7002/9975/files/vojetazulaxeloxevux.pdf
    • https://cdn.shopify.com/s/files/1/0437/7346/0641/files/rapilujusilomazasagoxid.pdf
    • https://cdn.shopify.com/s/files/1/0431/0122/5114/files/20192310327.pdf
    • https://cdn.shopify.com/s/files/1/0432/2902/0317/files/76471898826.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006350.bin
7499c302e728573c5b064e1969ed89ebdf04e2f96d49d4a9080ed56e27044a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6350 4976 bytes
font_01_sfnt_off00007450.bin
a89f94945fa07438bf2d7a0bc0b4f1a6dd63a85d25738a4297c56e91e616b581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7450 15148 bytes

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