Malicious PDF — malware analysis report

Static analysis result for SHA-256 7670d85792ab694f…

MALICIOUS

PDF

40.1 KB Created: 2020-08-23 02:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c50f8082272b73b1c7e6870ca2bfd7b SHA-1: 28e1b90802485b8cde7cc7c09becefc020bd1491 SHA-256: 7670d85792ab694f54947819d38f1d21f0d738186eddda05ae9ff80e1bded7cf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The ML classifier strongly indicated maliciousness, and the presence of a known malicious redirector URL further supports this. The document body itself is heavily obfuscated but contains references to URLs that are likely part of a link farm designed to drive traffic to 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.cc/pify?keyword=whole+duck+nutritional+information
    • http://tukozafi.nowhiringheroes.com/uploads/1/3/2/6/132695663/75f5142.pdf
    • http://files.donnaholdsworthart.com/uploads/1/3/1/4/131438456/8058159.pdf
    • http://files.adultgleeclubaustralia.com/uploads/1/3/0/8/130874257/5922012.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/zubub.pdf
    • https://cdn.shopify.com/s/files/1/0436/9491/5738/files/11892857131.pdf
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/20088670410.pdf
    • https://cdn.shopify.com/s/files/1/0440/1453/4806/files/talent_acquisition_strategy_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3764/files/modern_digital_and_analog_communication_systems.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/folepojifani.pdf
    • https://cdn.shopify.com/s/files/1/0429/1208/8231/files/1127658891.pdf
    • https://cdn.shopify.com/s/files/1/0464/2940/5336/files/block_story_hack.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/dameniboxaresewexiral.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_off00005fb8.bin
3bcb46a603ef58dc7b669ccca481cb542ba8f188b69adb8ed7ce5d6ec55ea7b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB8 5160 bytes
font_01_sfnt_off0000711e.bin
ddc59ce20949e3f1583b43eed16f9d86cac78611a3019bcad5394a1c68e2a618
pdf-font-stream PDF embedded font (sfnt) at offset 0x711E 10172 bytes