Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06caf5bfebd6209…

MALICIOUS

PDF

69.4 KB Created: 2020-08-11 09:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37b8b7aa28df923822de98b74c2f190f SHA-1: df9419ba15fe1133b07446b7efc80458ac07d8b2 SHA-256: d06caf5bfebd6209d8fd0b167286c768f5d3b3269ff96cab2d8a45146a46a650
152 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to domains associated with link farms and redirectors, such as ttraff.ru. The ML classifier strongly flagged this PDF as malicious. The embedded URL 'https://ttraff.ru/pify?keyword=ascaris+lumbricoides+morphology+pdf' is a critical indicator, suggesting the document is designed to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is indicative of a lure.

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=ascaris+lumbricoides+morphology+pdf
    • http://files.bitingintothecore.com/uploads/1/3/1/3/131380263/94ab3a1a4df.pdf
    • http://jokuwux.reidiantlighthealingstudio.com/uploads/1/3/2/6/132695306/1e1b85b456e4.pdf
    • http://files.sbsoutreach.org/uploads/1/3/0/7/130739715/jujaxoxanuwujin_raromuzavaga.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/dafaze.pdf
    • https://cdn.shopify.com/s/files/1/0437/2158/8888/files/zutim.pdf
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/45908684579.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/77807793810.pdf
    • https://cdn.shopify.com/s/files/1/0439/7747/4206/files/fimikakaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9520/files/wamobirale.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/fizezasalirok.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6886/files/86492694571.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/novezipuwuluserukari.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/98384466201.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/84532681375.pdf
    • https://cdn.shopify.com/s/files/1/0433/8611/0110/files/10068159408.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_off0000c4f3.bin
00887edc0fd029cb4a5727fcb05b2ea0d80fe181942b9324c3c0f2b52f52309b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F3 5496 bytes
font_01_sfnt_off0000d795.bin
c64396654f3a9037c3ad5010d3571b8612e0364f9c67f603f45124c2e8103542		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 10180 bytes
font_02_sfnt_off0000fa52.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 4324 bytes

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