Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cbbf71b4246884…

MALICIOUS

PDF

41.0 KB Created: 2020-08-10 20:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12902bde2e6f7470caaaf12ffccf2ee8 SHA-1: 7149a64775ff19c5b6faaa71cc2f458f6ee5adff SHA-256: d5cbbf71b424688482ec058e86e64d08c8f10bb38b347fd4f32977b2139d8289
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary malicious link pointing to a redirector at ttraff.ru. The document body, though obfuscated, contains text related to 'annabelle hayes workout pdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=annabelle+hayes+workout+pdf
    • http://files.aspergiannation.com/uploads/1/3/0/9/130969452/4836580.pdf
    • http://files.taylorrao.com/uploads/1/3/1/4/131438461/mopise.pdf
    • http://files.austinahh.org/uploads/1/3/0/8/130813778/mezevinudavo.pdf
    • http://files.rammothdm.org/uploads/1/3/0/8/130813899/vakosezavagak_zunumo_funasixoreti.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/reading_and_writing_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0438/3837/4050/files/psi_entities_101.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/45259271200.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8971/files/fuxutevuxoduvodef.pdf
    • https://cdn.shopify.com/s/files/1/0437/1926/2363/files/fort_hays_blackboard.pdf
    • https://cdn.shopify.com/s/files/1/0435/0754/8326/files/ihome_alarm_clock_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1362/files/3534762020.pdf
    • https://cdn.shopify.com/s/files/1/0441/3951/1960/files/nicotinamida_adenosina.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3893/files/certified_internal_auditor_materials.pdf
    • https://cdn.shopify.com/s/files/1/0439/8222/5566/files/convert_to_word_arabic_ocr.pdf
    • https://cdn.shopify.com/s/files/1/0431/5620/9819/files/3161892953.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/58958644705.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_off000061e7.bin
1b977bbcf538146ddb716fd3435bc13e2fc2a1827675ba3c15ad68638b53bb67
pdf-font-stream PDF embedded font (sfnt) at offset 0x61E7 5516 bytes
font_01_sfnt_off000074a9.bin
1b3f18ccadf39585be3f7f7b8495396d54adca5e7b4f1c49411584c4dba84c61
pdf-font-stream PDF embedded font (sfnt) at offset 0x74A9 10044 bytes