Malicious PDF — malware analysis report

Static analysis result for SHA-256 88195773dba72bea…

MALICIOUS

PDF

47.0 KB Created: 2020-08-22 19:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f1be440f170fd04cb84138d80170e97 SHA-1: f7a416f73b6f2e4e36d5940e7ad85ab327e4f166 SHA-256: 88195773dba72beafcb3eed85219bda60b250580b64af8c53ab67f80ae7efc6d
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 of which point to a link farm designed to generate traffic. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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=photo+search+free
    • http://files.metroartdesign.com/uploads/1/3/0/8/130813111/4567cc9c9ad6.pdf
    • http://files.re-bel.org/uploads/1/3/1/4/131410545/8133550.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/bebubinofovitibik.pdf
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/nuzekofepububasobiku.pdf
    • https://cdn.shopify.com/s/files/1/0428/4553/6419/files/small_catering_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/60468607882.pdf
    • https://cdn.shopify.com/s/files/1/0434/3676/9447/files/elves_bowling_online.pdf
    • https://cdn.shopify.com/s/files/1/0437/0297/6666/files/vobasusefenolekan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81599599528.pdf
    • https://cdn.shopify.com/s/files/1/0434/9467/0498/files/2596461396.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5026/files/4937071425.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.pdf
    • https://cdn.shopify.com/s/files/1/0438/3267/2418/files/jukixixamalajon.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5559/files/android_studio_setting_gradle_path.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/attagasam_full_movie_hd_tamilrockers.pdf
    • https://cdn.shopify.com/s/files/1/0433/1808/3742/files/la_intimidad_publica_beatriz_sarlo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ab6.bin
10c71a909b49d141d2dcf6f6f292ee08cb0fb5759944312552403e594387c5ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB6 3524 bytes
font_01_sfnt_off0000776d.bin
07f0eb4e08538bce0dfc263a103451dfa918a0e8a369cb597f07a940556bfcca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776D 4940 bytes
font_02_sfnt_off00008830.bin
79fc56ee404209d6038e7c2cd39267b09c7579caff744d5aff6dba82ffacf597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8830 11984 bytes

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