Malicious PDF — malware analysis report

Static analysis result for SHA-256 84993383eee7c4ed…

MALICIOUS

PDF

54.3 KB Created: 2020-08-17 12:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10f290e2e3aaa04bf4dee46e0d60698d SHA-1: be017b0021640b6acb7a79c3a042539f3e2dc2a4 SHA-256: 84993383eee7c4ed7de5c6076f08a02277d17cc0cc094c028a62b110f98b0214
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service identified as malicious. The document body, though partially corrupted, includes text related to 'proofs involving congruent triangles worksheet' and also contains the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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=proofs+involving+congruent+triangles+worksheet
    • http://files.ccwestlibrary.com/uploads/1/3/1/3/131378953/vogexilotuj-siniwovumexapoj.pdf
    • http://files.cottonshed.co.uk/uploads/1/3/1/3/131383318/49756.pdf
    • http://gaxod.drjaredwojnicki.com/uploads/1/3/1/6/131637459/8258121.pdf
    • https://cdn.shopify.com/s/files/1/0439/6879/0686/files/dogibagifoxabusonedemazog.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/60788429943.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/27637037228.pdf
    • https://cdn.shopify.com/s/files/1/0437/6068/1111/files/voyager_trike_kit.pdf
    • https://cdn.shopify.com/s/files/1/0429/6661/4175/files/wujuxuvuxamabokawarobu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9687/files/66158535621.pdf
    • https://cdn.shopify.com/s/files/1/0433/5216/2462/files/tcs_performance_appraisal_form_filled_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2485/files/28088276022.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/10921739371.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/livoxigugefeguvon.pdf
    • https://cdn.shopify.com/s/files/1/0432/7401/0782/files/63851647530.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072d4.bin
79af8f53f14acd76747c26f874c980e51e36c723aa8d42215d217ad2ad8303b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D4 5244 bytes
font_01_sfnt_off000084b6.bin
db193922bb24515a037ef775bf48939b61cf46985088c5bcb2fc1de6cea21b3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84B6 10328 bytes
font_02_sfnt_off0000a823.bin
23cddd42c17e4521c62a9e3e786a9e95a9a95c2807d327981898bd38117538af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA823 16256 bytes
font_03_sfnt_off0000bdaf.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAF 4324 bytes

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