Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9cbc69e63d82a7…

MALICIOUS

PDF

56.0 KB Created: 2020-08-04 21:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb39138edff8a6422a2246b0015e010d SHA-1: bf79c7c05f34a928ff2f25f592468a4706675e9b SHA-256: 1e9cbc69e63d82a7c237e276747f305dee5ea65a6a1d44b249532fd9aca2a337
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains the same URL. The presence of numerous external PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly flagged this PDF as malicious.

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=basic+thai+language+for+beginner+pdf
    • http://wofina.tuckantugs.com/uploads/1/3/0/8/130813765/jukorosiliw-neripevajej-mowugag-vubaxa.pdf
    • http://files.beyouclothingcollection.com/uploads/1/3/2/6/132695329/rabegax.pdf
    • http://files.madeleinefinley.com/uploads/1/3/1/4/131454040/kexakuxixeden.pdf
    • http://files.catholicfamilybootcamp.com/uploads/1/3/1/3/131398598/dufiwulikote.pdf
    • http://files.updateshappen.com/uploads/1/3/1/3/131380107/jiwabenodopuve.pdf
    • https://cdn.shopify.com/s/files/1/0441/0513/8328/files/17641360513.pdf
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/2112_cooperation_bomb_defusal.pdf
    • https://cdn.shopify.com/s/files/1/0435/7111/8235/files/wuludozuzofazetufijozar.pdf
    • https://cdn.shopify.com/s/files/1/0434/2009/0535/files/38219602745.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdf
    • https://cdn.shopify.com/s/files/1/0430/1488/1433/files/45789065050.pdf
    • https://cdn.shopify.com/s/files/1/0437/1110/3128/files/majesty_delirious.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/24625848842.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/gudevewalelotusebexit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/sujiparawapajeziralebibo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97253363073.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/mcgraw_hill_connect_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/8531/4715/files/nonprofit_financial_policies_and_procedures_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1747/8044/files/pilowiduzujedofuxazude.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9887/files/fundamentals_of_financial_management_12th_edition.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_off00008f2b.bin
51fb099dbe9c1d326e6ea3077c9c3269bcf315b52dfae414ee624d328ab62f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2B 5488 bytes
font_01_sfnt_off0000a1b4.bin
ebebc54a2187ef08b315c4d88e593de1add43dc4c39c8fdc96103253487d28b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B4 10144 bytes
font_02_sfnt_off0000c469.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC469 4324 bytes

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