Malicious PDF — malware analysis report

Static analysis result for SHA-256 099e07b9269f9da8…

MALICIOUS

PDF

46.1 KB Created: 2020-08-14 00:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a4c0bcb0cebd3f0a94d755d39412c20 SHA-1: bcdfe5fc582494691c74ed10cc10c501c4e1d4df SHA-256: 099e07b9269f9da8d8991c25d8a2c6738427b6a353f4611e01ea35bb0c05da17
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as a fantasy football guide. This is supported by heuristics indicating a malicious redirector and a link farm. The presence of embedded URLs and the ML classifier output further strengthen the assessment of malicious intent. The document body, though heavily obfuscated, contains the malicious URL and other benign-looking PDF links.

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=washington+post+beginners+guide+to+fantasy+football
    • http://files.acct301.ehabacademy.com/uploads/1/3/1/0/131069934/9a20e16b8.pdf
    • http://files.sscpn.org/uploads/1/3/1/1/131164185/8699612.pdf
    • http://files.westfieldheatingandairconditioning.com/uploads/1/3/1/6/131606280/31f50b421.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15750122344.pdf
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/acute_myeloid_leukemia.pdf
    • https://cdn.shopify.com/s/files/1/0434/1750/1852/files/tulolulifavipaxusa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8787/8549/files/weboduvetul.pdf
    • https://cdn.shopify.com/s/files/1/0435/7259/2801/files/wax_wings_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/1527459135.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/46770172404.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/intel_hd_graphics_3000.pdf
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/cuddly_amigurumi_toys.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6475/files/managing_engineering_and_technology_5th_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_off00007663.bin
40d7ce6391d0240e1a4c142c83a898eecca731c3de34ed7bafb9e4872bf9b2ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x7663 5556 bytes
font_01_sfnt_off00008947.bin
128d525a885947d5b1a555511af3402425a712a0df24b1bced8e96aa5eba8b1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8947 9776 bytes