Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a4eb8f17f67b5a…

MALICIOUS

PDF

35.4 KB Created: 2020-08-07 10:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31e1a394890743465594c9f345480d70 SHA-1: 2bf4fa144bbd4744d199a5858d6670cfc1834d24 SHA-256: f6a4eb8f17f67b5a8768f96df5a019bc89bf62c660758f6cbde9e252897be33f
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a significant number of embedded links. One of these links, https://ttraff.ru/pify?keyword=the+natural+history+book+pdf, points to known malicious redirector infrastructure. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. No scripts were extracted from this sample.

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=the+natural+history+book+pdf
    • http://files.lionheartgraphics.com/uploads/1/3/0/9/130969220/motolov.pdf
    • http://files.hanzykim.com/uploads/1/3/1/1/131163736/jetegokevijup_lekipixenisa_patugemexemaw_bisifofanabuta.pdf
    • http://files.oyccweb.com/uploads/1/3/0/7/130775484/2824881.pdf
    • http://files.dillooni.com/uploads/1/3/1/1/131164202/wusuw-movijilatizu-deguratugovax-komas.pdf
    • http://files.jachristensen-maker.com/uploads/1/3/1/6/131636769/nenomatib.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/lezunotekulebuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/mewasepixubovinulozopipo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0307/4971/files/20601118228.pdf
    • https://cdn.shopify.com/s/files/1/0431/9785/7954/files/bafojesudaguwovibufenagi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/jizupifotuguvuxipito.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/66619791117.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4547/files/90258824927.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0639/files/35482150508.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/banurekef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0432/7437/1235/files/mobemodajilakafelifalal.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1919/files/nitaxezoderifevanadakex.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/75791244936.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/
    • https://cdn.shopify.com/s/files/1/0435/6302/45

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fab.bin
bd3ca491ecc4a302d1b70e266f31579f3db08db0c5e453a7de2bccc29a849506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAB 5384 bytes
font_01_sfnt_off000061f6.bin
ffa60f8851be12175848d0cdf28647437ea8a35f5811161d7ca01631a064e098		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F6 8944 bytes

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