Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e9dbf694790d9d…

MALICIOUS

PDF

41.3 KB Created: 2020-08-19 22:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0978629b8a8d5d3d13362dbb5b1add0 SHA-1: 9a4b7c5c8f7496a70b817ff2a7ad4e2234b98a8d SHA-256: 52e9dbf694790d9df9e83ee570dd5ed7dc5fb9e5c64aacfb3f6bfa5e3c3b7a4f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious File

The PDF contains a critical heuristic firing for a malicious redirector link and a link farm, indicating an attempt to distribute or redirect to malicious content. The ML classifier also strongly flagged this PDF as malicious. The embedded links, including the redirector URL and numerous Shopify-hosted PDFs, suggest a campaign focused on SEO manipulation or content distribution.

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=moustache+template+array
    • http://xojire.michaeljperkinsschool.org/uploads/1/3/1/4/131437626/035437631ecce9.pdf
    • http://files.swannanoavet.com/uploads/1/3/1/6/131636914/f0762780fd.pdf
    • http://files.makeupbybb.com/uploads/1/3/1/3/131381712/zinomezumajiwet_xamaminiwoxesus_radan_gekero.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/nidufene.pdf
    • https://cdn.shopify.com/s/files/1/0435/6335/2227/files/dum_biryani_film.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4870/files/xefob.pdf
    • https://cdn.shopify.com/s/files/1/0428/4727/3116/files/tavosinisipuxavuxapotota.pdf
    • https://cdn.shopify.com/s/files/1/0437/1247/9382/files/31723469254.pdf
    • https://cdn.shopify.com/s/files/1/0449/1676/8923/files/2010_ford_fusion_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/makuzilivo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/oecd_crs_reporting_financial_institution.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23083433767.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_off000054b6.bin
a27773fe02e3cf7f554fac7baf38aebc2663acdb3e2eb1248cb634c61ccf8526
pdf-font-stream PDF embedded font (sfnt) at offset 0x54B6 5280 bytes
font_01_sfnt_off00006693.bin
a6a1bdc83186b2d9d610073c054715386784b4b015d6b75f3095c8824c694419
pdf-font-stream PDF embedded font (sfnt) at offset 0x6693 16124 bytes