Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa460e5aeb83a89…

MALICIOUS

PDF

47.2 KB Created: 2020-09-17 02:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc7c0c748da4fdc28e9525119c37701f SHA-1: 49af5ab19e0b276c15f79132fa6d2f6ab26dcb0e SHA-256: ffa460e5aeb83a8923423a325d6d9af1c8e562a22ff37cba35b0d4a73d661b57
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, includes the URL that triggered the heuristic, suggesting a lure to a fake technical guide. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of multiple external links, including one to a malicious redirector, indicates a phishing or social engineering attempt.

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.club/wix?keyword=vmware+integrated+openstack+administrator+guide
    • http://files.nnpsofaz.org/uploads/1/3/1/4/131437216/ffac8b23d.pdf
    • http://files.blackraven6.com/uploads/1/3/0/9/130969735/a5cd2e7fb456f.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3479/files/63051892099.pdf
    • https://cdn.shopify.com/s/files/1/0469/0008/4898/files/20578212470.pdf
    • https://cdn.shopify.com/s/files/1/0437/1687/0293/files/cash_book_entry_in_tally.pdf
    • https://a2ee7701-0e0d-4c12-9c12-201ee6c5e08c.filesusr.com/ugd/b5aed9_1c5f54ae7bfe42b5bc69c6a9ec0feed1.pdf?index=true
    • https://9dc9dd19-c5f4-4ae2-90db-049d2d513376.filesusr.com/ugd/c88839_81b5289a51684ceea8fcd8e3f4ba073e.pdf?index=true
    • https://311a4c29-c7dc-4879-bf9b-eb90bf4edb16.filesusr.com/ugd/cdfdba_368c457cd90a4c4694cf6d79d9c69644.pdf?index=true
    • https://54c59c72-eaef-4218-ba68-188feece2905.filesusr.com/ugd/696117_ce76bb716c3b497b95dfe95346745149.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/nevoziposajevejiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7191/files/neet_biology_chapter_wise_questions_and_answers_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/maai_teri_chunariya_lehrayi_audio_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/7078/3645/files/3947087552.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/kemikaviruvolig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aef.bin
a32712175bbcc724ea5afd7dff4d222faf6836a406b1513ef39be0ce1ba47c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEF 5364 bytes
font_01_sfnt_off00007d22.bin
b3a9ce272e64275a5401da802580f3f9e234126427bfdbf4d3c5d1137ebdfbd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D22 10704 bytes
font_02_sfnt_off0000a1bb.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1BB 4324 bytes

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