Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4ac90a6e7261cd…

MALICIOUS

PDF

68.2 KB Created: 2020-08-04 09:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d14a4737e996663e7337d0e32b86394f SHA-1: 2b0ff42aefb5c97b90164f6c645ab294f55cc846 SHA-256: 0f4ac90a6e7261cdce1f615afd73fb4e90f6bdbf8916ba9f22c21d088169fd71
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a malicious site. The document also features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution 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.ru/pify?keyword=amtrak+empire+builder+schedule+pdf
    • http://files.wauwatosaeastbandboosters.com/uploads/1/3/1/3/131383424/boxis.pdf
    • http://files.duboisfmc.org/uploads/1/3/0/7/130740357/2541872.pdf
    • http://files.projectufo.org/uploads/1/3/0/7/130739381/4877757.pdf
    • http://files.professorsilverblank.com/uploads/1/3/0/8/130814078/bc31c52f8b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/1171/6766/files/24350791763.pdf
    • https://cdn.shopify.com/s/files/1/0429/0838/5439/files/ximekasafim.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/sewudig.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/nenukurogiwanekeposusugad.pdf
    • https://cdn.shopify.com/s/files/1/0440/5323/3814/files/zigojavetiluwajuraz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9120/files/sezuwefujidevuwuzu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6457/files/sewuxitovasigokudibudag.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/67734007353.pdf
    • https://cdn.shopify.com/s/files/1/0433/3551/6318/files/lolakokagapapunazafegar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23313492251.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1362/files/86302694181.pdf
    • https://cdn.shopify.com/s/files/1/0432/2767/6829/files/29036234490.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baba.bin
1c8435efdc3c55aaa9ff023abfccb73201572d92f2347bcc8ef5f2cfc1419b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBABA 5588 bytes
font_01_sfnt_off0000cd8b.bin
2bd418090112ce244edb2f361372020687ae1a35a1e940c2af74964ec3f76a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8B 16612 bytes

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