Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5f40f61dbf9239…

MALICIOUS

PDF

49.2 KB Created: 2020-08-04 23:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc82633166737c9f027236168c85bb03 SHA-1: fb5c7637020bddefc79f1880330806c4d17341ba SHA-256: de5f40f61dbf9239d9932ae9e5dce473b0de0c2778c93ff5abf5d902d5bac3a1
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at ttraff.ru. The document body, though obfuscated, suggests a lure related to 'mineral identification lab pre lab worksheet answers'. The presence of a link farm and the ML classifier's high confidence indicate malicious intent. The primary attack vector appears to be directing users to malicious sites via embedded links.

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/wb?keyword=mineral%20identification%20lab%20pre%20lab%20worksheet%20answers
    • http://files.freedomsdoorssociety.ca/uploads/1/3/1/3/131379776/tadesafutodi_feganebojusa.pdf
    • http://files.randallsimonpiano.com/uploads/1/3/1/8/131856907/zedawajijuvanukuxawa.pdf
    • http://files.regalimagegermanshepherds.com/uploads/1/3/0/7/130775490/f8df9.pdf
    • http://files.countryyorkies.com/uploads/1/3/1/4/131407067/7819492.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49816413057.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/23282119243.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1829/files/56190388245.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niwaxesajikibulunetegidu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0805/files/53106893857.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/bulejef.pdf
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/31448250784.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/vivixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/sojalipufikabereloduja.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/59545293110.pdf
    • https://cdn.shopify.com/s/files/1/0436/1447/0302/files/68574369722.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/85474408078.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074a0.bin
73f3590225d2acc0fbec4edcbb9e39d1bede5f19bfdc957f7bb0cb77b79fe21d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A0 5332 bytes
font_01_sfnt_off000086bd.bin
cd93ce45d27813382c96c0b153df4489a04de328931ebe6d9b852e6ae69c1155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86BD 10044 bytes
font_02_sfnt_off0000a91d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA91D 4324 bytes

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