Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad4289a7a4bf6dd…

MALICIOUS

PDF

40.1 KB Created: 2020-08-12 12:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5662207749a0fc590a4c16aea6a0cc53 SHA-1: a5c8728fa6f109e1147aad69b8d4128a539bf4e7 SHA-256: 7ad4289a7a4bf6dd91c2d45f1eae39e3695873f2e401266abd1f63c8959c3c48
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 Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful infrastructure.

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=surgical+anatomy+of+the+heart+pdf
    • http://files.gutfreundcornettart.com/uploads/1/3/1/4/131454699/8444265.pdf
    • http://files.stuphotoart.com/uploads/1/3/2/6/132682655/7254959.pdf
    • http://files.brothersinthewild.com/uploads/1/3/0/8/130814900/1239264.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/comment_crer_une_page_html.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/gizomapo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2472/files/niloxifuralujuxufo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/voa_e5_8d_ab_e8_a7_86.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/97358357511.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3382/files/xilowuxaxevul.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/39432737524.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/wadezinat.pdf
    • https://cdn.shopify.com/s/files/1/0435/5365/2895/files/water_supply_and_sanitary_engineering_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/94029050098.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0617/files/nanijumiba.pdf
    • https://cdn.shopify.com/s/files/1/0431/3271/5163/files/cadences_piano.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8930/files/gofemijokez.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_off00005ecb.bin
959b3b789b0e05000c966f93b8f1b471114e4442f559062dbaf9c117fd7a62d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECB 5596 bytes
font_01_sfnt_off000071a9.bin
b4d1e50b508f411b6c4d3fc904580ffc09c2bdfc4a2baa18a7ec7e5b3a09aee8
pdf-font-stream PDF embedded font (sfnt) at offset 0x71A9 9952 bytes