Malicious PDF — malware analysis report

Static analysis result for SHA-256 806296e1437614d1…

MALICIOUS

PDF

57.4 KB Created: 2020-07-31 00:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd8801dbba22399bf1ec763f8ca38c3d SHA-1: 42f66531006c3a87810484e30e665b9b11713f77 SHA-256: 806296e1437614d15eff949953cfe554bc710fbd5aed36f82a5d2fb38be4ba34
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users into downloading malicious content. The document body, though heavily obfuscated, contains text related to 'pdf download' and appears to be part of a SEO link farm strategy to attract unsuspecting users. The ML classifier strongly indicates 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.ru/pify?keyword=concerning+the+spiritual+in+art+pdf+download
    • http://files.winstonawilson.com/uploads/1/3/0/7/130776267/zolovojidum.pdf
    • http://files.happinessandenlightenment.org/uploads/1/3/0/7/130775758/9b8e09ae44.pdf
    • http://files.dawn2duskhomeinspection.com/uploads/1/3/0/8/130874671/nobatoto.pdf
    • http://files.wyndlestrawdesigns.com/uploads/1/3/1/6/131637273/5829540.pdf
    • http://files.mrseitner.net/uploads/1/3/1/0/131070934/fe6c9.pdf
    • https://cdn.shopify.com/s/files/1/0434/6436/0100/files/41710814539.pdf
    • https://cdn.shopify.com/s/files/1/0437/0019/1387/files/dalefefebeno.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2742/files/41690972757.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0434/0868/7269/files/97356821243.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3708/files/jarobedizexilano.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/99619827009.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8920/files/webiwexogi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2121/9493/files/551158932.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/97623771780.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/59935761057.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_off0000a24a.bin
def6713ca810cc75e8c0a57de2debaccc72e3829204b0319636fe76c46b58fcd
pdf-font-stream PDF embedded font (sfnt) at offset 0xA24A 5416 bytes
font_01_sfnt_off0000b4be.bin
34e53c3165fd894877329014bea0849784c0d6a4138abc3e318c3a972e83d99e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BE 10240 bytes