Malicious PDF — malware analysis report

Static analysis result for SHA-256 80784878bad0a5d8…

MALICIOUS

PDF

45.6 KB Created: 2020-08-23 05:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5edfbece75b8fcc4d86c9d7f59e7e2b7 SHA-1: 6afb60a5c0bc284113de27e82677ffff27177bb6 SHA-256: 80784878bad0a5d8583acbcb2929eed86b76d3292195a6ae04c33c96fe11c7f9
154 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 external PDF files hosted on Shopify. One of the primary links directs users to a known malicious redirector at 'ttraff.ru', disguised as 'cfmeu wage sheets'. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The document's structure and link farm suggest an attempt to obscure malicious activity and potentially lead users to harmful content.

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=cfmeu+wage+sheets
    • http://files.cariboucafe.com/uploads/1/3/0/9/130969065/tepobaf-wesufumu-loxodexabuf-danazenawe.pdf
    • http://files.niwotptac.com/uploads/1/3/2/3/132302768/8803648.pdf
    • http://files.marriedmarks.com/uploads/1/3/2/8/132816158/wawezanuz-titun-resuta-ponupax.pdf
    • http://wotonimij.relationships4all.com/uploads/1/3/2/3/132303027/rezefaroxemenolupaso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0437/0553/2569/files/bread_bakery_business_plan_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2854/files/9893670135.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zutazalurofesavasa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/51868995246.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/75361421584.pdf
    • https://cdn.shopify.com/s/files/1/0462/6140/3802/files/fawidevovisab.pdf
    • https://cdn.shopify.com/s/files/1/0433/4072/6427/files/antonin_artaud_poesie.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/uber_brand_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/2832/4257/files/waweg.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/vimobujogoxenipirakanur.pdf
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/faguwisixotaran.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/braiding_sweetgrass_kimmerer.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_off00006746.bin
1f03a5992bcd3e09786d8b7c8852b51ce3a060a7ad6160ce7ce9819b74e8dc50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6746 4784 bytes
font_01_sfnt_off000077a4.bin
d5b9a131a530e2f7e529c3aeff7943447179b2480f57d3d71293dfec9e911df6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A4 10440 bytes
font_02_sfnt_off00009b41.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B41 4324 bytes

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