Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba9689416567721…

MALICIOUS

PDF

35.8 KB Created: 2020-08-22 19:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32bba643a6e8d04c53ce84bd7b60bcb3 SHA-1: 651d57a4c13f6daf407427dc3eedc70316d8ef31 SHA-256: 2ba96894165677214a7c6350324ec1fda5458b541e9e9bf6e192127df68122ca
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The embedded document body contains numerous URLs, including a primary suspicious URL pointing to a redirector service. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm designed to distribute traffic to potentially malicious sites.

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=datasheet+ldr+5mm+pdf
    • http://files.phoenixway.net/uploads/1/3/1/4/131453960/refogezijew.pdf
    • http://files.trojanaquaticclub.org/uploads/1/3/1/8/131871902/sirur_taduxasu_vupoxifikaperor.pdf
    • http://kinoda.wacg.info/uploads/1/3/0/8/130814328/wexas-galumawagu-fiteloximov-ruxenutosuxufi.pdf
    • http://fibako.christinawei.com/uploads/1/3/0/7/130775511/xaxire.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0793/files/zaletewalexurivepo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/pinisevutitesiseneb.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/analytical_chemistry_of_polycyclic_aromatic_compounds.pdf
    • https://cdn.shopify.com/s/files/1/0434/2707/0119/files/ruvagidasigekirutu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/surofufumot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mijafovaginidobu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4949/9289/files/16409515749.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/dofasidepelif.pdf
    • https://cdn.shopify.com/s/files/1/0437/4147/9066/files/21482288622.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/39206030593.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_off00004f0d.bin
0cca5fde176d758b3f9559468c7873075de863e1527c06a638e9b5a409009566
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F0D 5404 bytes
font_01_sfnt_off0000614d.bin
8469c52a72dc0ffa770c812a4808b84a351bfb4fdad4194832bb2104f351158d
pdf-font-stream PDF embedded font (sfnt) at offset 0x614D 9700 bytes