Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f01dca70e4b6c5…

MALICIOUS

PDF

44.2 KB Created: 2020-09-01 05:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: defac33293203174438545a267f16e55 SHA-1: 171eb7d7a931cf5a4126118f07f0df580849dea3 SHA-256: d9f01dca70e4b6c5cba646306e8f9cca73f15c238b041648cea0eaeae8e11740
152 Risk Score

Malware Insights

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

The PDF contains a lure for a 'Ccht renewal form' and embeds a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=ccht+renewal+form'. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the primary malicious intent appears to be redirecting the user to a harmful site.

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=ccht+renewal+form
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/linksys_ac750_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/7394/4217/files/44524554598.pdf
    • https://cdn.shopify.com/s/files/1/0447/8782/6854/files/lista_albergues_camino_frances.pdf
    • https://static.usrfiles.com/ugd/e2c250_b8e2e87a0ceb427ca2e6a87ffe7fe341.pdf
    • https://static.usrfiles.com/ugd/b8c837_464caf8764254d4f9b7d54c1c6813de3.pdf
    • https://cdn.shopify.com/s/files/1/0433/4786/9850/files/photo_slideshow_html_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/6563/0102/files/9105540812.pdf
    • https://cdn.shopify.com/s/files/1/0436/6240/9881/files/burning_love_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.pdf
    • https://cdn.shopify.com/s/files/1/0435/7118/3777/files/mezujawenejagos.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0946/files/fixivuvavagipefugi.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_off00006653.bin
50428d04178a76f8b9ef8171a34df4a999dafc1315f095f4100ee762016a3f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6653 4940 bytes
font_01_sfnt_off00007705.bin
2f197f93a5fb85c1ca46ecfc82b16db7748e477a993eb5650228f49e51413504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7705 14684 bytes

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