Malicious PDF — malware analysis report

Static analysis result for SHA-256 792df8bdd2ed7f1b…

MALICIOUS

PDF

42.2 KB Created: 2020-08-18 17:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2669c39a42fb97abaf5eb4c6c664961e SHA-1: ea352b73a094c76e3e9531f27afdc4f7f3757130 SHA-256: 792df8bdd2ed7f1ba95b903452022ed7310edf318e85a5bc45f9c288c0959b24
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly legitimate platforms. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=aerodynamic+car+pdf', indicating a lure to a potentially malicious site.

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.com/pify?keyword=aerodynamic+car+pdf
    • http://files.topshelfbonsaipots.co.uk/uploads/1/3/1/8/131857334/foxigolinusa.pdf
    • http://files.3jsmobilmusic.com/uploads/1/3/0/8/130813314/zuruzagati_pajozezaxu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1842/6267/files/nofezu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/biselewinanodajorenafug.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/bldc_motor_drives.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/56919337487.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/45479380024.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7461/files/dehydration_synthesis_and_hydrolysis_vocabulary_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/third_trimester_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/forerozalonejibexasekogar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72163988246.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/mrc_dyspnoea_scale.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44368867506.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006823.bin
adae4876f366eacf4004d049d83c1ec82459327089ae93352b4b52823343d3a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6823 5184 bytes
font_01_sfnt_off000079b6.bin
04182517d2d3840db128e264bae01c4989ee683ff2a563121faa1ef10053fefc
pdf-font-stream PDF embedded font (sfnt) at offset 0x79B6 10068 bytes