Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b3e66b886807c3…

MALICIOUS

PDF

43.2 KB Created: 2020-08-01 18:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cc8ad81adea27790749fa03dcc5c6c0 SHA-1: 20a4a2fa0eb11e2a841e92aef6ebe6f133444f78 SHA-256: 88b3e66b886807c327f410471989fa03bbb5406deecde10300a3090d194896b4
154 Risk Score

Malware Insights

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

The PDF contains a deceptive "Add- apt- repository: command not found" message, likely intended to trick users into clicking a malicious link. The embedded URL `https://ttraff.ru/pify?keyword=add-+apt-+repository%253A+command+not+found` is identified as a malicious redirector. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, suggesting a broader campaign to distribute malicious content.

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=add-+apt-+repository%253A+command+not+found
    • http://files.morristownsurgery.com/uploads/1/3/0/7/130775309/4738539.pdf
    • http://files.hembladeacupuncture.co.uk/uploads/1/3/0/7/130740211/tojaponolelogezifura.pdf
    • http://files.marzipan-media.com/uploads/1/3/1/8/131856184/7584706.pdf
    • http://files.crossfitchalmette.com/uploads/1/3/0/7/130776861/32825.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5663/5812/files/97573205428.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1463/files/soxazekotuxufazu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8519/3621/files/94014275754.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2125/files/22440137996.pdf
    • https://cdn.shopify.com/s/files/1/0432/8118/6971/files/86368457669.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/nisuwumeju.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/mozivurowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1565/8920/files/wefuguwumaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/62971616875.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/18633525908.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/mijoronegukateb.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/kifagemezovitigulo.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_off00006532.bin
7ff3aee133035c22e98704b08e5069af423c9851905e29ed6037a7f3fae204c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6532 5440 bytes
font_01_sfnt_off000077b5.bin
27a55cea2cb03d77507235e50a0e3959c77e8241c002f086245f2721df89fcc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B5 12432 bytes

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