Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f42c57e05310b8…

MALICIOUS

PDF

44.0 KB Created: 2020-09-01 00:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56bf550c2946dbeccdb838d65792488f SHA-1: 09d9f168e03a685a1784b8987496beca20027f56 SHA-256: 12f42c57e05310b8aeec0fecce5299a01cad2c81115fb748830774dec0313b7b
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=picture+frame+template+for+wall, suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links also points to a link farm or SEO abuse tactic.

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/wix?keyword=picture+frame+template+for+wall
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/45fd81_9cdca97eb5c6461b80e3e1c92cc0bb9a.pdf
    • https://static.usrfiles.com/ugd/0779a3_13f28ea2c3e243b0b0e7d73ebe9fdb8d.pdf
    • https://static.usrfiles.com/ugd/5e8de6_eb61a57452fb4038b11e27e966c5c6c7.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6335/files/34840927695.pdf
    • https://cdn.shopify.com/s/files/1/0432/5215/4532/files/dewaxukajibilenix.pdf
    • https://cdn.shopify.com/s/files/1/0435/6371/2671/files/ielts_speaking_test_marking_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/70236362441.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/4075008320.pdf
    • https://cdn.shopify.com/s/files/1/0432/7732/0352/files/wujigezuwi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4486/2114/files/sovanemotazufozejexiseda.pdf
    • https://cdn.shopify.com/s/files/1/0454/3709/1998/files/ansys_workbench_13_static_structural_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4885/files/astrology_101_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/4732/8664/files/96206539601.pdf
    • https://cdn.shopify.com/s/files/1/0429/7103/7855/files/14378662086.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1734/files/biochemistry_review.pdf
    • https://cdn.shopify.com/s/files/1/0455/6567/3637/files/beehive_class_9_solution.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_off00006cb8.bin
05d0e5e5c09454eb2824ba16758fcc6bd131d029277e0f887ecaf4fc2812be0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB8 5076 bytes
font_01_sfnt_off00007dfe.bin
0f894ee7dfff7b4678367f32189df2df35ab5c1f63254122ac3adb822b335815		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFE 10856 bytes

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