Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cff2e845776b42c…

MALICIOUS

PDF

33.3 KB Created: 2020-08-20 20:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fc3d93c3b1fefa28c4fe809c0d75eae SHA-1: 928dcb43679d7c8cdf49a990f305a19ba86b0a3c SHA-256: 5cff2e845776b42cdbd5a17227e9b10749dbfbd0b26193e81a9d641e64b04a2e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, with a critical heuristic identifying it as a redirector link farm. The primary malicious URL, https://ttraff.ru/pify?keyword=bukunmi+audio+songs, is likely used to obscure the final destination of the attack. The document body, though partially corrupted, also contains this URL, suggesting it is the intended lure. The presence of numerous other PDF links indicates an attempt to distribute malicious content broadly.

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=bukunmi+audio+songs
    • http://files.stradoneparklake.com/uploads/1/3/0/7/130775784/702251046.pdf
    • http://files.riveterlaw.com/uploads/1/3/2/8/132815298/vixogozis.pdf
    • http://pogutip.ajbuilding.net/uploads/1/3/1/4/131414661/9477652.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0577/1929/files/995835601.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/fogivasujodonetad.pdf
    • https://cdn.shopify.com/s/files/1/0439/0299/2536/files/22142325706.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5922/files/bookmark_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/ninagodamigiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5945/3845/files/atherosclerosis_symptoms.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/knee_replacement_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0429/9620/3679/files/23622322028.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/dogumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3069/9414/files/88729840805.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_off00004436.bin
efc02060759031284c0add4552a1c45857ed4212f69e82d41eaf97bfa8d1111b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4436 5132 bytes
font_01_sfnt_off00005598.bin
acbc1c3f2dc9da239fa9bad0b606e260a28a5f9c10cdf4323733a3c6b58ce6ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x5598 10316 bytes