Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a07e7740935ed0…

MALICIOUS

PDF

37.3 KB Created: 2020-08-06 19:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ce18e196d31c04e611899e40c27e6b5 SHA-1: ae48327739acf94f65e9976891c79f2a1182898f SHA-256: 87a07e7740935ed0e5c57b00bfcbb5ed0f696d87d6ad8369b7f71447dc116bfb
152 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for a product manual, which is then linked to the malicious URL. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, many hosted on Shopify, suggesting an attempt to game search engine results to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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=maquina%20de%20lavar%20brastemp%2010kg%20manual
    • http://files.rechoir.co.uk/uploads/1/3/1/4/131437812/ed9770e5f4dfd3.pdf
    • http://files.ridesgr.com/uploads/1/3/1/4/131437676/wugejotowupon.pdf
    • http://files.moannasworkroominteriorsandstaging.com/uploads/1/3/1/3/131380666/xemotoloxo.pdf
    • http://files.andilockemears.com/uploads/1/3/1/3/131379971/80c7ae7c7f9871c.pdf
    • http://files.pommedapidaycare.com/uploads/1/3/1/0/131070711/d8e1d64fa4.pdf
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/mesimujos.pdf
    • https://cdn.shopify.com/s/files/1/0428/6332/9446/files/judoge.pdf
    • https://cdn.shopify.com/s/files/1/0431/2019/7789/files/70144429015.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/jikewilijawejezofixuvebak.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/vukudukiwunezavedogej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zipepatijexozuzazes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/97103536150.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebisineseboji.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004978.bin
d34e5798e60da052a714909e1d4db869f990987ee6660b5715cc3e3d8bb42e93
pdf-font-stream PDF embedded font (sfnt) at offset 0x4978 5868 bytes
font_01_sfnt_off00005d65.bin
65dd9b7fe71f445b729062abbfc749a11fd0d09648c6615be795a91db5bcb82e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D65 13828 bytes