Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f187cfa26703fb…

MALICIOUS

PDF

42.6 KB Created: 2020-08-30 03:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8e5a115df96374bd7db4f44cf56f278 SHA-1: 15e02a47f3a53fef75907d1a84f1a0dc413d4382 SHA-256: 09f187cfa26703fb04cba54ee3bcfa14d763d19034475f2aef50d236fa795809
154 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, likely for SEO manipulation or to obscure the malicious destination. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's strong positive result suggest malicious intent.

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=advanced+mechanics+of+materials+solu
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0445/6228/4703/files/przyimki_miejsca_angielski_wiczenia_dla_dzieci.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/76148250862.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/distance_vs_time_graph_worksheet_middle_school.pdf
    • https://static.usrfiles.com/ugd/b8c837_fba881b756674e429f852991f1cceaf2.pdf
    • https://static.usrfiles.com/ugd/eda9ba_c1a1b2147b2a44029173eaaa3d6aaadb.pdf
    • https://static.usrfiles.com/ugd/cc10e7_ec2775922af946a799837cd412329c56.pdf
    • https://cdn.shopify.com/s/files/1/0438/5384/0534/files/jawuto.pdf
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/kikurufotitodagogexigi.pdf
    • https://cdn.shopify.com/s/files/1/0440/3740/6870/files/artifacts_in_mri.pdf
    • https://cdn.shopify.com/s/files/1/0443/8137/2582/files/docker_kill_container.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/discuss_personality_development.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92904811518.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_off00005feb.bin
159aaa04d16bfff52b5aea6b231f0772f62bd3cdb7efbe4a82cc301c4cb757a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEB 5192 bytes
font_01_sfnt_off0000715f.bin
2154210331306390af462078c4d507053612929d5d6aa2960ec7f64403173780
pdf-font-stream PDF embedded font (sfnt) at offset 0x715F 9256 bytes
font_02_sfnt_off00008faa.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAA 4324 bytes