Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e55b73855f2f8b…

MALICIOUS

PDF

52.8 KB Created: 2020-07-30 09:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5915a83489b60b6779d715513618f90b SHA-1: 205b54f2f20088c5e58f2ffc296ce8aae7a487c2 SHA-256: 69e55b73855f2f8b22546a69846861118814375cd3f00c457752597115bccf15
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'ttraff.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search results or distribute content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm.

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=capsulitis+adhesiva+hombro+pdf
    • http://files.herbalmassagemartin.com/uploads/1/3/2/3/132302924/fa51185.pdf
    • http://files.flos5dollarhouseofbling.com/uploads/1/3/1/4/131437005/guwigamufi-mileb-jusizafi-galoliv.pdf
    • http://files.craftedcasesnc.com/uploads/1/3/2/6/132682745/wuranirupaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/tidibibomezobole.pdf
    • https://cdn.shopify.com/s/files/1/0428/9452/4579/files/48861475228.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/dibivojenatasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/26568136522.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9401/files/16988358074.pdf
    • https://cdn.shopify.com/s/files/1/0437/1070/9915/files/77934997136.pdf
    • https://cdn.shopify.com/s/files/1/0432/8269/4312/files/mowabepototalenanigavuvu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/85626723715.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/41452054111.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/filimixurofutawig.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_off0000905b.bin
881cf8fad128ec59986155376083db8f91de0f9a901dc3c8cf331e130ad74a01
pdf-font-stream PDF embedded font (sfnt) at offset 0x905B 5280 bytes
font_01_sfnt_off0000a251.bin
b4a53c5b1f906bd56c2257616244bde02f411881cbe5bac7214b3426f79ac57a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA251 10440 bytes