Malicious PDF — malware analysis report

Static analysis result for SHA-256 61881ef544501189…

MALICIOUS

PDF

38.0 KB Created: 2020-08-21 08:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1afbf4e8ab490d1028bb9918d50a4957 SHA-1: 4f2c3508cbef0068ad5490bb59f89a5b8173d237 SHA-256: 61881ef544501189461ceb39b2e79cee1ce8cab123d5bfa213d49ba807312c69
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to seemingly benign Shopify URLs but also including a critical link to a known malicious redirector at 'https://ttraff.com/pify?keyword=chess+titans+mac'. This suggests the document is part of a link farm or phishing campaign designed to redirect users to malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=chess+titans+mac
    • http://files.echolightfarm.com/uploads/1/3/0/7/130739376/2509703.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/zesegovuxemavewelinu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8845/files/eclipselink_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/5802/0000/files/terms_of_reference_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/butterfly_flower_images.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2092/files/grade_1_math_worksheets_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/1406/0189/files/kupobiwiliperetatu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/highway_capacity_manual_6th_edition.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_off00005653.bin
0b4bfffe78976cfaaaa877d1c3ad8a1ff070ac8f94040faabb16363b601e7d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5653 4816 bytes
font_01_sfnt_off00006683.bin
b049f7d73ca436d0ebb1ec0d5654b834fd4873cd7abd85603bdeea5affe56720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6683 11424 bytes

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