Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b9c07dfffb4cc5…

MALICIOUS

PDF

97.2 KB Created: 2020-08-09 04:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e93b262d8f9692d39c5481ee846909c1 SHA-1: 8aebfe60c0b32847dfd8541202a8168cf38687f8 SHA-256: a2b9c07dfffb4cc51ad46b5533712bb04a2e304052d5e92dd96527982dee9819
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The PDF also contains a link farm heuristic, indicating a large number of external links, with the first being to a Shopify domain. The ML classifier strongly flagged this PDF as malicious. 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=andrea+dworkin+free+pdf
    • http://files.fordandfordins.com/uploads/1/3/1/4/131408204/sivurexujaful_fubisopisus_fukebemaji_tidipir.pdf
    • http://files.deepgrassgraziers.com/uploads/1/3/0/7/130739456/wirudole.pdf
    • http://files.paulayersart.studio/uploads/1/3/2/6/132683459/vukozeturu_ledajem_famug_pavatebi.pdf
    • http://files.lovefoodandyoga.com/uploads/1/3/0/7/130774994/gawovozafake.pdf
    • http://jobuxufa.briankirschcapetown.com/uploads/1/3/1/3/131398455/d7d2e429.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/sample_personal_statement_for_masters_scholarship.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/rigosixixifanomofetiseb.pdf
    • https://cdn.shopify.com/s/files/1/0437/7726/1729/files/the_curious_case_of_benjamin_button_story.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/fijijebupod.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/neoliberalismo_histria_e_implicaes_david_harvey.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/newupobilorarafujebuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/5161/4359/files/zuzuvumifubuxekifisor.pdf
    • https://cdn.shopify.com/s/files/1/0430/0298/6659/files/murezofime.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/97370602772.pdf
    • https://cdn.shopify.com/s/files/1/0444/1980/9447/files/botw_baked_apple.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/58880776799.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/xivigozepopivi.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_off00013fd7.bin
e3a61297d4adfb8688798641d1e530d240dd28b440c0426f1730d12ccb5d787a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD7 4968 bytes
font_01_sfnt_off000150e9.bin
36d9889cd04b94fd7a8051868ac7bb60c01a74acd9e7b0d0d49a03efb8cc1101		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150E9 11400 bytes

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