Malicious PDF — malware analysis report

Static analysis result for SHA-256 998d1d934fdd6b8d…

MALICIOUS

PDF

42.2 KB Created: 2020-09-19 11:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3398f200049ddca0f74657c87ebbe8c9 SHA-1: 8732da5f730630d28ec093ce476890729908ef19 SHA-256: 998d1d934fdd6b8dfb41b25312d9980aee7990c9fa6059ced25366a83824ef6f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=monopoly+title+deed+cards+uk'. Additionally, it exhibits a PDF link farm behavior, with numerous links to PDFs hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be SEO manipulation or distribution of further malicious content via a link farm.

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.link/wix?keyword=monopoly+title+deed+cards+uk
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/59662625548.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7791/files/62222782411.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0058/files/free_lagu_agnes_monica_teruskanlah.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7305/files/fare_action_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/2784/0669/files/zowufunugirujuluwope.pdf
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/jojijasufifon.pdf
    • https://cdn.shopify.com/s/files/1/0428/2974/2246/files/yooka_laylee_trophy_guide_roadmap.pdf
    • https://cdn.shopify.com/s/files/1/0431/7138/1405/files/sowazogugutugarugegimaret.pdf
    • https://cdn.shopify.com/s/files/1/0432/7997/4556/files/monenasafepewas.pdf
    • https://cdn.shopify.com/s/files/1/0429/2119/7724/files/84487079960.pdf
    • https://cdn.shopify.com/s/files/1/0429/7841/0655/files/inspirational_story_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/kinetika_adsorpsi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/limadede.pdf
    • https://cdn.shopify.com/s/files/1/0428/7148/8668/files/closed_cell_flexible_foam_insulation_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/dizerininigobibugeve.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/ruvar.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_off000066b9.bin
e022e5f225bfadf54b65e80cde9e3c6b7245ab8685cc3f6a44869df53a3a8931
pdf-font-stream PDF embedded font (sfnt) at offset 0x66B9 5236 bytes
font_01_sfnt_off000078ab.bin
1f5994e3a1d3e0c870d2e4ab11f7a00da9cc01f74cc20556b82649195c157540
pdf-font-stream PDF embedded font (sfnt) at offset 0x78AB 10320 bytes