Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b89cda52346b44…

MALICIOUS

PDF

39.5 KB Created: 2020-08-19 09:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d6cf34e6b622d9fa24f0dbcd697bda6 SHA-1: bc95ac29a9069c8940de03e0886dd5161e53f75d SHA-256: d8b89cda52346b44f5218233597c52eb9c69fec3a1969a0ebd75b5fa06393241
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at `https://ttraff.ru/pify?keyword=conflict+resolution+worksheets+for+middle+school+students`. The document body, though heavily obfuscated, appears to contain text related to 'conflict resolution worksheets for middle school students', suggesting a lure to disguise the malicious intent. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine ranking for malicious content.

Heuristics 3

  • 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.
  • 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=conflict+resolution+worksheets+for+middle+school+students
    • http://files.ginnyscoffeehouse.com/uploads/1/3/0/7/130775393/aa8990.pdf
    • http://rijudigot.matrixalgorithmsinmatlab.com/uploads/1/3/1/3/131398362/4fd2619a96783.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/99249873566.pdf
    • https://cdn.shopify.com/s/files/1/0436/9609/5397/files/asvab_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/8828/8675/files/cross_cultural_adaptation_theory.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/74024791601.pdf
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/golang_template_range_string_array.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/69725109147.pdf
    • https://cdn.shopify.com/s/files/1/0448/2636/2013/files/gene_polymorphism_definition.pdf
    • https://cdn.shopify.com/s/files/1/0451/9283/9317/files/automatic_watch_parts_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/medical_surgical_nursing_brunner_and_suddarth_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/3439/4276/files/70705921783.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/abstract_algebra_an_introduction_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/varogugokun.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_off00005f28.bin
777bea067c95534095ff12a5df7717152727830a2fe9221b322e0bbcecddd2b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F28 5112 bytes
font_01_sfnt_off0000706f.bin
1c17522089d99717ab4fd7a038017242ef04907e46c18e9383775be6bdaddfb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x706F 9492 bytes

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