Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f087f4da2daf824…

MALICIOUS

PDF

43.0 KB Created: 2020-08-22 00:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 309af78455c1f06939872726df50e6b7 SHA-1: cb0707ebd7a0d07c19342d7c35747a6171ca4e42 SHA-256: 8f087f4da2daf8246a70b3398bc8b6635b1e0e9b3f1f30cc2ba6de95a962260e
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, contains text related to 'buy formal dress' and the redirector URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting the user to malicious infrastructure via the embedded link.

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=buy+formal+dress
    • http://xasuwapo.donjenkinsjewelers.com/uploads/1/3/1/8/131856257/6a694.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1800/files/vegatekoputan.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5312/files/saxik.pdf
    • https://cdn.shopify.com/s/files/1/0429/6084/7004/files/neoplasias_malignas_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0431/5722/5638/files/armstrong_pull_up_program.pdf
    • https://cdn.shopify.com/s/files/1/0435/4503/4911/files/27116495672.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/what_is_behaviorism_theory_in_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0435/7816/3359/files/29227044955.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/lens_flare_eyes_meme.pdf
    • https://cdn.shopify.com/s/files/1/0431/7600/1704/files/11767233254.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/types_of_anaemia_in_pregnancy.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_off00006ab5.bin
689b57d183e40a23c017f7ab39b4466cae22f5b0b2708276720e50ad84565dad
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB5 5204 bytes
font_01_sfnt_off00007c59.bin
520123c9a5038e589e206cda182be6e733d68b4f4eb2fc8d71c8705f91f2206c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C59 10388 bytes