Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da09b85ee431fa8…

MALICIOUS

PDF

38.5 KB Created: 2020-08-11 02:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b342768ec9566476901067130dcdcc08 SHA-1: d37389348dfe84ddcb2ad3be884b7528c0255323 SHA-256: 6da09b85ee431fa8acb0cdfc635aa8ab0674328cec974e6e4de4d6e766ac3c89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to appear as legitimate PDF downloads, but the primary link redirects to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this redirector is known to be malicious. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL.

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.cc/pify?keyword=symbolic+logic+book+pdf
    • http://files.xofitnessstudio.com/uploads/1/3/0/7/130775633/puvivoju-lavik-zegubujupo.pdf
    • http://files.cybercats5436.com/uploads/1/3/1/8/131857914/c2d0f4e7532903.pdf
    • http://files.defriasconsulting.com/uploads/1/3/0/7/130738792/dc308defb4.pdf
    • http://files.cnycommunityacu.com/uploads/1/3/1/4/131453982/5284345.pdf
    • http://files.bellizzibaseballcamp.com/uploads/1/3/1/0/131070911/9606387.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/4582/6205/files/platinum_mathematics_grade_7_teacher_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/9903/8631/files/vejup.pdf
    • https://cdn.shopify.com/s/files/1/0437/3925/0853/files/85227286843.pdf
    • https://cdn.shopify.com/s/files/1/0434/1979/5623/files/bihar_district_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/nenonoxugugitupar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18410569865.pdf
    • https://cdn.shopify.com/s/files/1/0430/2539/9971/files/1972_chevelle_malibu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6657/files/72321461320.pdf
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/60396922269.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/lexigesezulolomituzene.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5234/files/dixaboxepexoguxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4302/8120/files/refizuxobusitozajafavas.pdf
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/twilight_book_free_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fe6.bin
f8d295551c4315937cb3a1a64978bd4f00aca17a5164679e18ab0675ebb8ab19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE6 5400 bytes
font_01_sfnt_off0000623b.bin
a9cf3b3f5903e0836ac7eb2bee0b32f4628367559c5c76e57511d258567a8a0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623B 13188 bytes

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