Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddfc197e7551686…

MALICIOUS

PDF

34.0 KB Created: 2020-08-17 18:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15945bdfa313e88e00ecbb94e67a3b5a SHA-1: 2884674c405cf834cf57a7a5745325f38499bff0 SHA-256: 8ddfc197e7551686ace5b3979972e61becb7e732c749063a8a6a59e7b0fbb24d
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identified a large external PDF link farm, suggesting a potential SEO manipulation or content hosting scheme. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact user-facing 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.cc/pify?keyword=f+m+d+r
    • http://files.azkillerbeessoftball.com/uploads/1/3/0/8/130874518/jemizip.pdf
    • http://files.jasonsmurphy.com/uploads/1/3/1/4/131409017/4758547.pdf
    • http://files.reefshawproductions.com/uploads/1/3/0/8/130814085/leriwupir-zalixulafimal-wegokivexibok-doruzuwoxuxaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7246/files/pune_detailed_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0362/files/xabarofuloferazede.pdf
    • https://cdn.shopify.com/s/files/1/0431/7131/5876/files/29260796663.pdf
    • https://cdn.shopify.com/s/files/1/0434/1979/5623/files/built_up_edge.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/valhalla_knights_2.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/numuzerejoluzatunekor.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7201/files/puketozigufevawukudifoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/1865/7697/files/retadopipujuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7423/files/3602879198.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/10_breakthrough_technologies_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/tavifulikubejafejijo.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_off0000494b.bin
bbeada80d1d8e17c57e9a4d848350af78d50f72ffd398c4b5e257a49c02ce23d
pdf-font-stream PDF embedded font (sfnt) at offset 0x494B 4504 bytes
font_01_sfnt_off00005888.bin
4ce3380ca9521fc43bb2000b261d9689625a81404c70d2738277c4da6d17db18
pdf-font-stream PDF embedded font (sfnt) at offset 0x5888 10320 bytes