Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb58792f866f0758…

MALICIOUS

PDF

34.9 KB Created: 2020-07-10 01:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35177bf4b8dc487ee63da5c85a3d8bb2 SHA-1: 3f2398f38af1e9964ba9f820de67956582fbb997 SHA-256: fb58792f866f0758f5569e9b0bf937498793a76aabbb1772542e0c02368553ab
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to suspicious domains and are likely part of a link farm designed to improve search engine rankings for malicious content. The document body text mimics a search result for a textbook, further supporting the lure tactic. The primary malicious link identified is https://ttraff.ru/wb?keyword=essential%20cell%20biology%205th%20edition%20pdf%20download%20free, which is flagged as a redirector to known malicious infrastructure.

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=essential%20cell%20biology%205th%20edition%20pdf%20download%20free
    • http://files.mootingsyndicate.org/uploads/1/3/1/4/131483253/lewotidedimitufemini.pdf
    • http://files.warrensburgheritagetrail.org/uploads/1/3/1/3/131397930/tavivixeja_tukumadevekiwum_wenapemo_xalegomip.pdf
    • http://files.savemetislighthouse.org/uploads/1/3/0/7/130739769/bf9a61739dd.pdf
    • http://files.budderpros.net/uploads/1/3/1/4/131438840/bugufodatezik.pdf
    • http://files.passionhouseconcerts.com/uploads/1/3/1/4/131452806/wowisifozot.pdf
    • http://files.beebrighthives.com/uploads/1/3/1/1/131163561/bdf6e4d.pdf
    • http://files.mrsararadian.com/uploads/1/3/1/4/131453676/725d0ad5d8b20d.pdf
    • http://files.jeffcofiretraining.org/uploads/1/3/2/6/132681409/4110604.pdf
    • https://dulidegoli.files.wordpress.com/2020/06/97726897101.pdf
    • https://mebanebezog.files.wordpress.com/2020/06/mubusexetire.pdf
    • https://tizamugoli.files.wordpress.com/2020/06/8904925830.pdf
    • https://dorupotidosu.files.wordpress.com/2020/06/44361234713.pdf
    • https://pomatufalep.files.wordpress.com/2020/06/78405917641.pdf
    • https://daxinupapi217247652.files.wordpress.com/2020/06/65007167579.pdf
    • https://zifapudig.files.wordpress.com/2020/06/femikexuvujaveki.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jedajuzosefowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nomevorijodasulalo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pedarivorenali.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_off00004b2e.bin
e3e8b20e2d904e4ac87aae6452aefdacbd5c7322510233b6609853a1f9107e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B2E 5620 bytes
font_01_sfnt_off00005e4a.bin
5168ada84b9328ebf03886c9eb72bbb801b8c435b7700a05f72e4a461eca92b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4A 9444 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.