Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f27631911a50132…

MALICIOUS

PDF

39.9 KB Created: 2020-08-15 07:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd35f21f9602040716e3264180149b5e SHA-1: 6bbaac1064cb47cee76f2073d978835c6db88825 SHA-256: 7f27631911a5013277db6e0ea3bb24519e8c31e498686fa7f88d94a2875fd15e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector and a large number of external PDF links, characteristic of a link farm. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests an attempt to lead users to malicious content. Although no scripts were explicitly extracted, the PDF structure itself facilitates the attack by hosting these 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=3d+wallpapers+for+laptop+free
    • http://tagozo.gertybrown.co.nz/uploads/1/3/2/8/132814930/bb033a.pdf
    • http://files.thehivepto.com/uploads/1/3/0/7/130775516/6772745.pdf
    • http://gogirisu.joankramerprofiling.com/uploads/1/3/1/3/131383708/7144299.pdf
    • http://files.mashawmcguinnis.com/uploads/1/3/1/0/131069906/vaxiti.pdf
    • http://files.masoncitychristian.com/uploads/1/3/0/7/130740391/xigisupokijuwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9531/7918/files/gogaguzewesu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1098/0000/files/frp_bypass_apk_with_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0827/files/434594861.pdf
    • https://cdn.shopify.com/s/files/1/0429/4380/7654/files/tumaczenie_zda_angielski_gimnazjum.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/41690709555.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/penanesugebepuleter.pdf
    • https://cdn.shopify.com/s/files/1/0451/6282/3834/files/pp1_curriculum_design.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/nejibomimawotitimilusidu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8700/2790/files/xowazasabakelanuxomafakif.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1068/files/19928131758.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_off00005d7b.bin
d66a1333efdd1da2fdf704e9cbfee3cab025971c29c60567a086dd4b4ed5ea35
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7B 5196 bytes
font_01_sfnt_off00006f43.bin
c904d4b86a85061aa8758a9b7bc562aec882511be02235112ced2290e004d54f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F43 10296 bytes