Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c8d94c770f524b…

MALICIOUS

PDF

38.1 KB Created: 2020-08-29 23:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 093957573b8335e02f07f9aa672a38d1 SHA-1: 6bd65596133fb18af4ffcf494878a42a36193880 SHA-256: 11c8d94c770f524bdc09cf26676fa521cf36062703d42196c6e0779b31b7282a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. It also exhibits characteristics of an SEO link farm, embedding numerous links to PDF files hosted on Shopify. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to a dishwasher manual. The ML classifier strongly indicates maliciousness.

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=ge+profile+qp48+dishwasher+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4959/9644/files/statistical_research_methods_in_the_life_sciences.pdf
    • https://cdn.shopify.com/s/files/1/0429/0461/7119/files/51465056065.pdf
    • https://cdn.shopify.com/s/files/1/0433/7952/3751/files/nulanamuv.pdf
    • https://cdn.shopify.com/s/files/1/0451/5436/9690/files/17215326444.pdf
    • https://cdn.shopify.com/s/files/1/0430/5692/2777/files/judobigivopoworezavabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7624/files/centro_de_distribucin_oper._metropolitano_d._f.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4638/files/simixebirege.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4214/files/lumalusenudazegiritezete.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/50653707251.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/powinitilufolijawerela.pdf
    • https://cdn.shopify.com/s/files/1/0441/3957/7496/files/57485969468.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3124/files/calibration_methods_and_standards.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4906/files/aptitude_and_reasoning_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/solution_of_wave_equation_by_separation_of_variables.pdf
    • https://cdn.shopify.com/s/files/1/0433/0956/4068/files/english_nursery_rhymes_book.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/ireland_work_permit_form.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005382.bin
023e273225f7266e84379a943d12b8f889ad2c07344396d5cb125fd56260dd11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5382 5812 bytes
font_01_sfnt_off0000673a.bin
aaab990adbc78990b27a7eee549dbe0832d15ab91af5d30a3a51a838222ed3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673A 10724 bytes

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