Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedbae9c18f28377…

MALICIOUS

PDF

41.0 KB Created: 2020-08-16 13:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cf91b731198f0089e25f247c0ff392d SHA-1: 96151465d40f5396c045e2a0b4e28c58d5fa3f97 SHA-256: bedbae9c18f2837736ff3da4c09c4fde90ead774b4a0147e080c5ea47b5ebf11
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a link to a known malicious redirector at `ttraff.com`. The document body, though heavily obfuscated, contains text related to 'pdf converter' and the malicious URL, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure, likely for phishing or further malware delivery.

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/wb?keyword=pdf%20converter%20small%20size%20online
    • http://files.scharencycles.com/uploads/1/3/0/7/130776118/ginukaxezunat.pdf
    • http://files.scottinglis-kidger.com/uploads/1/3/0/7/130740392/dozeburatosot-bagunimekoxuxad-gibidage.pdf
    • http://files.midamericadragway.com/uploads/1/3/0/7/130776462/rulojidu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/dele_b1_cervantes.pdf
    • https://cdn.shopify.com/s/files/1/0439/2547/1400/files/antibiotic_resistance_test_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3773/6603/files/16707721114.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/54662425940.pdf
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/jawonufijorixi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/82542746780.pdf
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/cancionero_catlico.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/zefatutinelazuritumos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tavolotifejenirogamofiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/83272050610.pdf
    • https://cdn.shopify.com/s/files/1/0435/8963/2155/files/vamezudagadanevavaselane.pdf
    • https://cdn.shopify.com/s/files/1/0432/7125/8278/files/hec_approved_supervisor_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9803/files/cacique_tango_brasileiro.pdf
    • https://cdn.shopify.com/s/files/1/0434/0449/2965/files/duxajesupesebotaxazi.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_off000062a8.bin
670f21535b7cedb0fa8d1b15082749ec197fcdc40308b2497885af6722bcfa2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A8 5280 bytes
font_01_sfnt_off0000748c.bin
f374c28771ecc41d523c63e3e4732f5312d732ed7cbae33885c52c93d6ed5388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748C 10220 bytes

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