Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d92ce1bc3e1afc…

MALICIOUS

PDF

39.6 KB Created: 2020-08-14 08:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7df4eb75d34b2e66bf4c1c8b4acb23da SHA-1: bdb25823961ab8ea01e3a748a24f309239e9143a SHA-256: 16d92ce1bc3e1afc8a0e6455dc7938a645f845bb014e4d4523a105492abaab1d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, forming a link farm. One prominent link, 'https://ttraff.cc/wb?keyword=modals%20of%20necessity%20and%20obligation%20pdf', is identified as a malicious redirector. This suggests the document's primary purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, and the document body is heavily obfuscated.

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/wb?keyword=modals%20of%20necessity%20and%20obligation%20pdf
    • http://files.jcaweb.net/uploads/1/3/0/7/130738991/bikopomotul-jumuvizanebuw-dijufup.pdf
    • http://leluja.centralcoastwineworks.com/uploads/1/3/0/7/130775085/mufuvefi.pdf
    • http://files.gingerschultheis.com/uploads/1/3/0/7/130739126/7046234.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/gizapidejedagigarujemu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3626/2052/files/fishing_knots.pdf
    • https://cdn.shopify.com/s/files/1/0437/2296/5160/files/berasofexokinelefilemo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/zewaxezedawutut.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/61417796866.pdf
    • https://cdn.shopify.com/s/files/1/0435/0253/4822/files/biafran_war_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0434/7156/9046/files/dezelaraxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1578/files/92077331197.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/71407097719.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4172/files/91212918304.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/50902471554.pdf
    • https://cdn.shopify.com/s/files/1/0428/0900/0103/files/vukikudekalasazisojigimi.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_off00005c69.bin
e8fd564f5b22f238fc26ccea2672d5c5b54c4e4ec4d88c88d3960aca12580c3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C69 5476 bytes
font_01_sfnt_off00006f2f.bin
1a0fd9b224ef65dc25eb09cc0b7733c6c8f51cec4514e8bdb3dd3dc56d5ce3b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2F 10060 bytes