Malicious PDF — malware analysis report

Static analysis result for SHA-256 645d92a33503cd52…

MALICIOUS

PDF

44.9 KB Created: 2020-08-19 07:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb8c9c6457b0fa92f7799ddfac1f8988 SHA-1: c6e32ac54ca1879d37f7a3115ff05f27156abb8a SHA-256: 645d92a33503cd52cc1f37eccf4203c3d4ce7cb1aae2f987b1c93c4a3c2523f3
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for phishing and malware distribution. The document body mentions 'Caste validity form 16' and includes the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential link farm used for SEO poisoning or distributing further 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.cc/pify?keyword=caste+validity+form+16
    • http://files.quintabella.com/uploads/1/3/0/7/130775490/jimutafesuxirife.pdf
    • http://nazeb.parablecandlecompany.com/uploads/1/3/0/7/130738854/5930211.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6213/1878/files/97547215571.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8139/files/ribajalamedasotenafovi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2648/0290/files/86664374662.pdf
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/vulanisipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8944/4510/files/fijikovizewit.pdf
    • https://cdn.shopify.com/s/files/1/0435/8206/2753/files/sumogerikulevajuxaxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7087/1970/files/cape_slot_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/28403215908.pdf
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/irs_form_8917.pdf
    • https://cdn.shopify.com/s/files/1/0428/8439/9270/files/76471828405.pdf
    • https://cdn.shopify.com/s/files/1/0434/6655/5558/files/2474613159.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/caffe_install_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0454/4217/1038/files/84250205622.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_off0000723f.bin
330aa9e9f70accc928463e28e1452ee805bab502588f42d2cc4c9b1e78ed988e
pdf-font-stream PDF embedded font (sfnt) at offset 0x723F 5328 bytes
font_01_sfnt_off00008454.bin
628e6e21bbe17d25417be30cb7d62f2cd280762bedeca5f38caf4b8b84b91541
pdf-font-stream PDF embedded font (sfnt) at offset 0x8454 10084 bytes