Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a80b84f9283efa…

MALICIOUS

PDF

45.7 KB Created: 2020-08-26 08:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04dc0245da9507bfd965c9e12f65a60f SHA-1: 80e577b61a42e5049be7ec7590373041bc903b59 SHA-256: 77a80b84f9283efa013e1ac78aa5ffed1aa118852d1e9486d550535a290e6e96
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The document body, though partially corrupted, includes the URL that triggered the malicious redirector heuristic. The presence of numerous external PDF links suggests an attempt to drive traffic to potentially malicious or SEO-spam content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=kyste+poplit%25C3%25A9+et+huiles+essentielles
    • http://files.artworldschool.com/uploads/1/3/1/8/131872137/pufosilexuxejesoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8249/7700/files/mamemozabinodokegefujekid.pdf
    • https://cdn.shopify.com/s/files/1/0440/4042/1541/files/sarkari_result_a_l_p_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/6631/0299/files/gobezalafenura.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/doviritapomovaxasezudizur.pdf
    • https://cdn.shopify.com/s/files/1/0440/4799/0934/files/wuwixaxegipopozafozi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1124/2144/files/51148663921.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0441/3331/8808/files/la_fontaine_de_mars_guide_michelin.pdf
    • https://cdn.shopify.com/s/files/1/0434/5177/7185/files/42135978997.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_off0000706d.bin
821729c74cdffb231cebcc6025bb922c578e7da25b8b62dc29ac70a245d9003e
pdf-font-stream PDF embedded font (sfnt) at offset 0x706D 4816 bytes
font_01_sfnt_off0000808e.bin
d6c67a2099daf44fca07267375867f8434ba2810db17290bdfac55f37c9facd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x808E 12712 bytes