Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc41f1d2d023c205…

MALICIOUS

PDF

41.8 KB Created: 2020-08-06 05:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fbd1fc43596859a3b72110d2f791262 SHA-1: ca9ffb3048dd5ba4a7494c63185cba5e07ba0812 SHA-256: dc41f1d2d023c20586cb6dbe4744fbf386a3c8bbdfa9e51412e7becf7f668af6
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body and heuristics indicate a lure to download a PDF novel, which likely leads to malicious content or further redirection. The ML classifier strongly supports the malicious verdict.

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=download+pdf+novel+alma+aridatha
    • http://files.thefibreshop.com/uploads/1/3/1/3/131382841/zadugas-rilaxejalibome-kudonozipobibap-saluwodukosefom.pdf
    • http://files.thesanctuaryatmn.com/uploads/1/3/1/8/131856184/d83262d07.pdf
    • http://files.drrobyngraber.com/uploads/1/3/1/3/131384281/dabapusori.pdf
    • https://cdn.shopify.com/s/files/1/0440/3747/2421/files/12044381010.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetelonum.pdf
    • https://cdn.shopify.com/s/files/1/0437/4632/8737/files/net_mathematics_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9960/files/93592385741.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/experiments_in_general_chemistry_featuring_measurenet.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/2161109278.pdf
    • https://cdn.shopify.com/s/files/1/0439/4414/9150/files/65388148093.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/usarec_form_1037.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/52056841474.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/movazupotilatasufokurunet.pdf
    • https://cdn.shopify.com/s/files/1/0437/0527/0437/files/fetutevaberopa.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_off000063d0.bin
7396044f3047e4350ae1468ced7762c8d69275b78d2fd18c8bc796a58d4f85f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x63D0 5256 bytes
font_01_sfnt_off000075a6.bin
a8d762c78a96cb193db3c35e4ccbff3b64e9b24dd320bcaff84b76ae57db7d05
pdf-font-stream PDF embedded font (sfnt) at offset 0x75A6 10780 bytes