Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c9dfbf57a0afe2…

MALICIOUS

PDF

43.5 KB Created: 2020-08-14 16:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d160f66f01ae384500dd9c876a819480 SHA-1: 835f139b547c65a2dbe4adbbeb0ba5f0c111a9e6 SHA-256: b2c9dfbf57a0afe2de83037257d4156138a1224c81fe4c5fa526b094eb9fbf78
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting a SEO poisoning or similar content-luring tactic. The ML classifier also strongly indicated maliciousness.

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.com/wb?keyword=types%20of%20electrical%20cable%20glands%20pdf
    • http://files.janellecox.com/uploads/1/3/0/7/130775987/basoxozalujisod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/cambridge_o_level_english_language_past_exam_papers.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/18_x_26_perforated_aluminum_sheet_pan.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/nozibunuzisilorajibezeluz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/lafirajowonogekar.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2443/files/71961072804.pdf
    • https://cdn.shopify.com/s/files/1/0434/5842/9089/files/menuluwesizuvigepogojag.pdf
    • https://cdn.shopify.com/s/files/1/0437/8230/8002/files/shooter_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/2666/9987/files/64253524675.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2217/files/73062115179.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74140302582.pdf
    • https://cdn.shopify.com/s/files/1/0433/0432/1184/files/80704522310.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/operational_amplifiers.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_off00006c5f.bin
686e12060b5ec3ca30f9bfc341124ea02d3b60914b097b6eab53c671fe75228d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5F 5512 bytes
font_01_sfnt_off00007f28.bin
40b042fb7e51b9a5f3d281aba2c30e53b186c52bde5276631f06ad74ff87b7fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F28 10012 bytes