Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c0c3f40b9f4539…

MALICIOUS

PDF

56.9 KB Created: 2020-08-17 16:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79ab4df8e39b685861ddb4ec8bd7a7bc SHA-1: 6a045dd83cc480e71e6268d522d1c5abfab92fdb SHA-256: 83c0c3f40b9f4539a428c20f8d81f149df70c0b352987942a26c227801cf1dde
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 redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to ttraff.cc, indicating a likely attempt to redirect users to malicious content. 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.cc/pify?keyword=sheet-+fed+offset+lithographic+printing+press
    • http://fuvanes.sarahscustomtumblers.com/uploads/1/3/1/4/131452988/vinisugobesabu.pdf
    • http://files.bill-tourguide.com/uploads/1/3/2/6/132681836/senivejuvudes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/51241957903.pdf
    • https://cdn.shopify.com/s/files/1/0432/3737/6157/files/nekedupasegij.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/94207342556.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/guvoxiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/3456/5025/files/69664889277.pdf
    • https://cdn.shopify.com/s/files/1/0434/4378/1788/files/android_tv_remote_control_pro_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8586/files/27911245615.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5798/files/vizezowoxepigus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/actos_de_habla_john_searle.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009565.bin
4fd8b06ae7b01397d2c77a3dcba52ff26bcb2ca7af2808bad159501623691b76
pdf-font-stream PDF embedded font (sfnt) at offset 0x9565 5340 bytes
font_01_sfnt_off0000a784.bin
eb11f13d97cf1f7e67f3d80b72947a013d19b6bb1959710882cd96731f2e1a32
pdf-font-stream PDF embedded font (sfnt) at offset 0xA784 9796 bytes
font_02_sfnt_off0000c905.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0xC905 4324 bytes