Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ab7e92461e7dc0…

MALICIOUS

PDF

45.5 KB Created: 2020-08-22 16:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f399e71537863961484ae6690b2fc277 SHA-1: f9aad27ccba0e59b086125aa56758dac35b8ece4 SHA-256: 71ab7e92461e7dc0e87ac763db63a71a3c0604b553b52c38fd9547abad053926
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is also present in the document body. This indicates an attempt to direct users to malicious content. The PDF also features a link farm, suggesting SEO manipulation for traffic redirection. While no scripts were extracted, the presence of malicious URLs and the PDF structure strongly suggest a phishing or malware distribution attempt.

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=all+movies+apk+file
    • http://files.clmsavid.com/uploads/1/3/0/8/130814774/afb1c35.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/lopovake.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/xerivixezovaxopun.pdf
    • https://cdn.shopify.com/s/files/1/0434/8094/0710/files/sublime_text_3_free_license.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0983/files/totimepopamixonuket.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51994241049.pdf
    • https://cdn.shopify.com/s/files/1/0437/1483/8679/files/nakatadazaboze.pdf
    • https://cdn.shopify.com/s/files/1/0432/9521/1680/files/93115309636.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/47997865039.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/wekelipa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/xerigigovoxixodekip.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/nopesujiwobisiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5074/5512/files/tujerozupu.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000627e.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x627E 6744 bytes
font_01_sfnt_off00007365.bin
a451f19a90f37498351c9a41e2fe78a0654076edefd5585c2cd63ba77422d58a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7365 5064 bytes
font_02_sfnt_off0000849f.bin
08509e181be70d3ff13c97a24f9c138218d9043230266f11b8fdd3b23ace9686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x849F 10480 bytes

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