Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb4b9e238212e24…

MALICIOUS

PDF

41.0 KB Created: 2020-08-31 11:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3444febd16a383940aeff06fc74cbab9 SHA-1: b0734ac770b31d997fd76406c6dc3101c9ec51a5 SHA-256: 8cb4b9e238212e24bb75c81e845a13aacac40575f4cd1cd0f7096e870ef6ad67
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=the+metamorphosis+franz+kafka+literary+analysis'. Another critical heuristic identified a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL and the link farm strategy point towards 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/wix?keyword=the+metamorphosis+franz+kafka+literary+analysis
    • https://static.usrfiles.com/ugd/0cd019_819316f8fb1f4175a2504e434d960247.pdf
    • https://static.usrfiles.com/ugd/b8c837_0564db30819642d980ce7fa014338bad.pdf
    • https://static.usrfiles.com/ugd/87d215_9861a27d2b4a4acbb7f48c6c9c4511e0.pdf
    • https://static.usrfiles.com/ugd/b47706_2266bdfae13c41c7a82873225845375e.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/piwakaminiletaxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5622/files/merelukegadano.pdf
    • https://cdn.shopify.com/s/files/1/0462/3305/9479/files/pepapufizokalemodikan.pdf
    • https://cdn.shopify.com/s/files/1/0431/9019/0248/files/motisupedutedipisofox.pdf
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/ziwed.pdf
    • https://cdn.shopify.com/s/files/1/0438/7949/7896/files/87461928403.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d64aeb2fd244f58acb219daefbb57bf.pdf
    • https://static.usrfiles.com/ugd/4d400c_c1df158bbb9348e0a8d745fdef6d10ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_57c7de3b0d364c1fbf8deb0b00ac6e9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d746cacea8cd4c9a86ccd86b9cf76171.pdf
    • https://static.usrfiles.com/ugd/d5415a_de35b559b16f4ce1866c72964eebfec9.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_off000062a6.bin
09370d358293aa522e6420d7efb9077af74db867dd124820554717acb773c9ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A6 5304 bytes
font_01_sfnt_off00007499.bin
1e25831e56a34440af15be1fd82ada8e1430392177d92b39017acaf866875f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7499 10060 bytes

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