Malicious PDF — malware analysis report

Static analysis result for SHA-256 4474e7e1ff3de888…

MALICIOUS

PDF

44.2 KB Created: 2020-08-13 22:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65deb47dfd6d51e6d5b338952d6b85ce SHA-1: d8a00f0165258a7f665e3f82e758676a2b0b03e1 SHA-256: 4474e7e1ff3de8887e83d292e8c09196d9853c82ddee3fb91941f1ac66e68592
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though partially corrupted, contains text related to educational worksheets and the wkhtmltopdf tool, suggesting a lure to disguise the malicious links. The primary attack pattern involves tricking users into clicking these links, which likely lead to further malicious content or exploits.

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=adding+unlike+mixed+numbers+worksheets
    • http://files.appleseedshomenursery.com/uploads/1/3/1/4/131437956/fapewajivipufu.pdf
    • http://lamesig.ccsdsummeredventures.com/uploads/1/3/1/4/131407995/608501.pdf
    • http://files.fossilfindersenterprises.com/uploads/1/3/1/6/131637218/5109959.pdf
    • http://files.eliterealtyintl.com/uploads/1/3/1/0/131070230/7277548.pdf
    • https://cdn.shopify.com/s/files/1/0435/7154/4225/files/72799788440.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/beckett_basketball_card_price_guide_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/christian_theology.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/42280788145.pdf
    • https://cdn.shopify.com/s/files/1/0428/5284/3676/files/the_look_of_disapproval.pdf
    • https://cdn.shopify.com/s/files/1/0437/1261/0472/files/xusugos.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7568/files/heat_treatment_of_copper_alloys.pdf
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/18681508694.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/types_of_sound_absorbing_materials.pdf
    • https://cdn.shopify.com/s/files/1/0435/0027/3830/files/kibuwos.pdf
    • https://cdn.shopify.com/s/files/1/0435/5837/1480/files/playboy_magazines_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/xewabofopivakalevumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/duvave.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_off0000540d.bin
4b5b7112c6ba9a12865828b625ed2bb1426cba2ca2c4fdb1df01973f19a27ea4
pdf-font-stream PDF embedded font (sfnt) at offset 0x540D 5380 bytes
font_01_sfnt_off00006639.bin
b4a2189657f13d36961a3ef256cdc313781c319cf41583b011a5bef055124055
pdf-font-stream PDF embedded font (sfnt) at offset 0x6639 9608 bytes
font_02_sfnt_off00008750.bin
ea34c0613c564936f7df53d1b6ff28e524594c1044862f8870f109d9e7abe38b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8750 18412 bytes