Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9bbf3a20878eb2…

MALICIOUS

PDF

55.1 KB Created: 2020-07-30 17:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d99953bf5b80bd2d50308d4dbd31ac06 SHA-1: 0428ab26a95c7473d47ed6a88e00e5113dc36861 SHA-256: 3c9bbf3a20878eb204e80106c1ef46b51d18f9f530ba641c47e3fed90156c61f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link and a link farm, indicating a lure to external malicious content. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword suggesting a book download. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, suggesting it was generated programmatically. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=amrita+pritam+books+in+english+pdf
    • http://files.maynemath.com/uploads/1/3/0/7/130740130/viwijalebugorag-kosorud.pdf
    • http://files.newzealandgnosis.co.nz/uploads/1/3/0/7/130739457/2631336.pdf
    • http://files.plan-my-trip.eu/uploads/1/3/0/7/130775284/7043385.pdf
    • http://files.woodyshticks.com/uploads/1/3/1/3/131379612/ritozo_luwubuvilul_bizifodoli.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/webake.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/94244732725.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/63462420281.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/xobajufeji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44329390643.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65069223210.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/25145396571.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89120683065.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/pezuzirujidenomuduvar.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/gifuravesamibapafadige.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/
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/xobajufeji.p

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008cf4.bin
50125e262a67d77ab7418f9cd76b3d8858ee43782f718de20ec8ed0a5bed123b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF4 5436 bytes
font_01_sfnt_off00009f33.bin
7a01621ef18416cebea9a7207f9fc1047d04227e2aa1c827028c07a6a2b2d6df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F33 10204 bytes
font_02_sfnt_off0000c263.bin
a1f656f60197781f96864c2de4cdfd2347bc27167c60158da750bd5d07b2aa04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC263 3028 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.