Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ca32e86ee64fda…

MALICIOUS

PDF

42.3 KB Created: 2020-08-22 03:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3e20f358aea5d8b8ca46d75e6444820 SHA-1: b58d5d02bd731befb8f68b5f00fd603c1f8edbcc SHA-256: 19ca32e86ee64fda22de5cb91ee0af0b42ece5e9a30da7a1fea872e4acfed326
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=insect+bite+treatment+guidelines+pdf, which is a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary goal appears to be directing users to potentially harmful content through a deceptive lure.

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=insect+bite+treatment+guidelines+pdf
    • http://files.juliaschombergart.com/uploads/1/3/1/6/131606815/gigamulavezosexoma.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1637/files/23556883589.pdf
    • https://cdn.shopify.com/s/files/1/0437/8171/8173/files/94530882979.pdf
    • https://cdn.shopify.com/s/files/1/0448/3776/5282/files/barril_del_amontillado.pdf
    • https://cdn.shopify.com/s/files/1/0430/9326/2487/files/25481679636.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/free_company_profile_design_template.pdf
    • https://cdn.shopify.com/s/files/1/0436/2302/2752/files/air_conditioning_company_profile.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2707/files/72303323089.pdf
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/sewora.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/peboxev.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/wotudixe.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/convention_cedaw_en_francais.pdf
    • https://cdn.shopify.com/s/files/1/0437/4901/5713/files/spring_boot_hibernate_mysql_example.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_off0000661e.bin
344af1adff8d0de934f61aeef28a5030f1008cbd91dab19f5ec0cf65b75ffb1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x661E 5552 bytes
font_01_sfnt_off000078d9.bin
ab93fa9e7998a7a37bc395458e0a7e59ef53e90a496378b3395212aef05099f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x78D9 10376 bytes