Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cff5567ae8d30d6…

MALICIOUS

PDF

46.4 KB Created: 2020-08-05 07:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 739bae2f8b2f0e95b80ee830be503a81 SHA-1: 086470d38acb9c9e00980f33d5c6e309cfaa3704 SHA-256: 6cff5567ae8d30d68e78c35093d572495a24e025679d37f412cb5de23e326bf4
162 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though partially corrupted, contains a URL that is also present in the link farm, suggesting a coordinated effort to distribute malicious links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=international+league+against+epilepsy+guidelines+pdf
    • http://files.sagireconsultingfirm.com/uploads/1/3/0/8/130874554/1819056.pdf
    • http://files.aquaclearpx.com/uploads/1/3/1/8/131858044/3415118.pdf
    • http://files.grammazooexotics.com/uploads/1/3/1/4/131407148/mizaxom.pdf
    • http://juxino.altaanz.org/uploads/1/3/0/7/130738993/vinemava.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4316/8156/files/57038278229.pdf
    • https://cdn.shopify.com/s/files/1/0434/1979/5623/files/fezezexuzinuviv.pdf
    • https://cdn.shopify.com/s/files/1/0428/4026/0775/files/64274644274.pdf
    • https://cdn.shopify.com/s/files/1/0428/7476/5475/files/48492283167.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/maplestory_reboot_training_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/15790107458.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/vasokejikigidowuvaxez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/proform_850_eliptical.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3870/files/gamenej.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/mario_bros_atari.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/mods_para_minecraft_1._8._3.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/51749093528.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/how_tall_is_171_cm_in_feet.pdf
    • https://cdn.shopify.com/s/files/1/0439/1154/4987/files/99991321670.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_off000076b1.bin
63d4f9fca199d6ae03975f05529e68270b6e42867d0223a692ad9cdc9fc5c363		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B1 5248 bytes
font_01_sfnt_off000088a5.bin
69625b6bd9f1593a88f775b633dbc4327badf6030e2866c0350acaf3c0fb7d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A5 10420 bytes

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