Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf00b7387b8fc7f4…

MALICIOUS

PDF

44.0 KB Created: 2020-08-16 11:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff2b4bb113948cf19e63561168da66e SHA-1: c9d3661165e07ad6de0bfac5d17e2abd378db84a SHA-256: cf00b7387b8fc7f4c8e687f20386a76dc893e96a7f6915bc296199911235a121
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc), suggesting a malicious intent. The document body contains text related to 'Ias exam date sheet 2019', likely a lure to entice users to click the malicious links. The presence of a large number of external PDF links, many hosted on Shopify, further supports the link farm attack pattern.

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=ias+exam+date+sheet+2019
    • http://files.elmermeats.com/uploads/1/3/1/3/131380480/9076105.pdf
    • https://cdn.shopify.com/s/files/1/0452/8082/1410/files/71713268658.pdf
    • https://cdn.shopify.com/s/files/1/0435/5240/7704/files/inventory_stock_register_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38140624907.pdf
    • https://cdn.shopify.com/s/files/1/0435/8691/2413/files/empirical_process_techniques_for_dependent_data.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/budget_meal_planning.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2070/files/lovumaga.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/tajarumidizitumolu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8734/5304/files/96082025140.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/79444668910.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0933/files/62487271561.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8266/files/nasudakudalolawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/42674913539.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5431/files/nozit.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_off00006e01.bin
d5499a8438bb5808ccf2acd5cf287e140fa6a3ceddd553bb212aebf769d16326
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E01 5424 bytes
font_01_sfnt_off0000805f.bin
7b1fe7c3f9c331caa98135e12d4a45ad0d0d3d6a32fc385e7c3ef89b915fb4fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x805F 10256 bytes