Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f9caa5f3ac85d4…

MALICIOUS

PDF

38.4 KB Created: 2020-07-23 02:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18c64affb2713bd8e8a2f3cc376c4206 SHA-1: 40f4e96abc8536884183a5ece3f82b180c431979 SHA-256: f8f9caa5f3ac85d4c017dff030711791c8737d995848454f1899fe928e36cabb
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a search result for 'Descargar coros pentecostales letras y acordes pdf'. The document body, though heavily obfuscated, appears to contain metadata related to wkhtmltopdf and a date, suggesting it was generated programmatically. The presence of numerous links to Shopify-hosted PDFs, some of which are benign, indicates a potential link farm or SEO manipulation tactic to obscure the malicious redirector.

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.com/wb?keyword=descargar%20coros%20pentecostales%20letras%20y%20acordes%20pdf
    • http://files.brewandplowfarm.com/uploads/1/3/0/8/130813307/2173498b62b.pdf
    • http://files.crossroads-vet.com/uploads/1/3/2/6/132681296/wavik_wubivusife_bosebakupiwilud_pinazog.pdf
    • http://files.forahumanfuture.org/uploads/1/3/0/7/130739699/dafijatujexuw.pdf
    • http://files.rgadesignquilts.com/uploads/1/3/1/3/131378923/tizubexufofim.pdf
    • http://files.voxinabox.com/uploads/1/3/0/8/130814935/e6caec0bfd.pdf
    • http://files.forahumanfuture.org/uploads/1/3/0/7/130739699/dafijatuje
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/65568660713.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/35258702862.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/zogesegirexibonazewipama.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5372/files/82752855633.pdf
    • https://fakesuni.files.wordpress.com/2020/07/68800744635.pdf
    • https://dinipexus.files.wordpress.com/2020/07/nututapobafofotumuvil.pdf
    • https://juxiwag.files.wordpress.com/2020/07/vilawuw.pdf
    • https://pedofakodav.files.wordpress.com/2020/07/36664329844.pdf
    • https://kefuxozo.files.wordpress.com/2020/07/muwalipiropakid.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/gufafenijaseve.pdf
    • https://cdn.shopify.com/s/files/1/0430/3575/4650/files/86578295223.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/90310541928.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/ximisekexakivonuxatik.pdf
    • https://cdn.shopify.com/s/files/1/0431/8068/7524/files/69296409150.pdf
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/41447392040.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/rokifuvasamekemudofedusip.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_off00005949.bin
8f5753e356e7a0261acd53394e481c518f7fdf86f22020f1315d6dd308b54da4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5949 5164 bytes
font_01_sfnt_off00006af0.bin
9ee578e73c1cf600784b6652195cada00e579c91a4dc062d73a2f055a6f80a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF0 9592 bytes

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