Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22ab4e7bc35a0ee…

MALICIOUS

PDF

48.8 KB Created: 2020-08-17 04:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9848ce9e2d57b2d3125719d77d26d39 SHA-1: 7a5c24664fbdfa8ed15712fb92bfc4c986c998e5 SHA-256: a22ab4e7bc35a0eec7f4e27fbab0dcb712f3f1f088241e11f2630c0368ed04e8
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=basketball+scoresheet+form', which is flagged as malicious. The presence of a link farm and a malicious redirector suggests a phishing or malware distribution attempt.

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=basketball+scoresheet+form
    • http://xenanujed.bestgatelatch.com/uploads/1/3/0/9/130969723/3cfc23.pdf
    • http://files.rimrockmanagement.biz/uploads/1/3/2/7/132740501/lagusazuxujo_kedip_nexozi.pdf
    • http://files.knowinghorse.com/uploads/1/3/1/3/131379113/9765755.pdf
    • http://modugepen.robinetengineering.com/uploads/1/3/0/7/130776647/nipef-rokopiv-mizawuru.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/34882003791.pdf
    • https://cdn.shopify.com/s/files/1/0435/5316/1367/files/cdf_of_max_of_uniform_random_variables.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/57878614044.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/45273984070.pdf
    • https://cdn.shopify.com/s/files/1/0436/1220/9309/files/5279871994.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/network_administrator_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/7816/4387/files/empirical_labs_distressor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/1009/files/mofuvinogazami.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_off00005fb8.bin
e87ca212dfee2c57f902fb6a4d1f29253e78bd086cdb5acd53bc058808cea253
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB8 5008 bytes
font_01_sfnt_off000070bb.bin
243886e40d4f42c752c98e09568d5520eef109700d94a00813c06b4e414d781e
pdf-font-stream PDF embedded font (sfnt) at offset 0x70BB 10068 bytes
font_02_sfnt_off0000936a.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
pdf-font-stream PDF embedded font (sfnt) at offset 0x936A 16092 bytes
font_03_sfnt_off0000a832.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xA832 4324 bytes