Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5b879187aa00d5…

MALICIOUS

PDF

52.4 KB Created: 2020-09-22 07:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00d5f453796b8e3d139f0f5fec048e26 SHA-1: 665e8fe43399793115e4288855ffb6cf4a88b495 SHA-256: ee5b879187aa00d57b370c118006cbc43ea3605a21c45c14acb661f63758a599
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that includes 'bowling king mod apk'. This suggests a lure to trick users into downloading potentially malicious software. The document also exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs, likely to obscure the malicious intent. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/wb?keyword=bowling%20king%20mod%20apk%201.50.8
    • http://dolirub.desireeswanson.com/uploads/1/3/0/7/130776007/1dd67eacd09dc.pdf
    • http://nesole.mediaanddemocracy.com/uploads/1/3/1/8/131856177/39d77.pdf
    • http://pifibu.stevemacspics.com/uploads/1/3/1/4/131452976/bf4f3f.pdf
    • http://files.confidenceandpoise.com/uploads/1/3/1/8/131856877/6047511.pdf
    • http://files.wonshanmushroom.com/uploads/1/3/2/3/132303010/65db5.pdf
    • https://8b20bdc3-533f-4fb8-b533-17d3db7b59f7.filesusr.com/ugd/739437_7a6f1eec1d344ab1bb24145ff9003b02.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/4900/0864/files/english_grammar_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0483/7202/3445/files/qdoba_nutrition_facts.pdf
    • https://cdn.shopify.com/s/files/1/0429/2552/3103/files/mahalaya_movie_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/free_bee_life_cycle_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/supply_chain_management_in_airline_industry.pdf
    • https://cdn.shopify.com/s/files/1/0428/4442/2310/files/nimesenuvekabovavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5474/3200/files/bulk_density_calculation.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000a3e1.bin
3d83e0e3acfc0cb95e8b23edc9cb68367f14c62a18610a8d7783378eca792a9f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA3E1 19456 bytes
font_00_sfnt_off00005752.bin
0274bcdaeac036982f59156e13af1dabd7e74a7e9adf0a2e7295bfc0c1d6646c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5752 2880 bytes
font_01_sfnt_off0000618f.bin
f0dcb2f68b5b2ac1fe14e3da1af2fe7e1447476b3a69b9185ee7235daad368f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x618F 5752 bytes
font_02_sfnt_off0000752e.bin
90aa148bc986341636fe8937063de5f91f7f4aa68bdf804a5132b80cc2828567
pdf-font-stream PDF embedded font (sfnt) at offset 0x752E 2460 bytes
font_03_sfnt_off00007ee2.bin
96902987750ae84e3033981894551226b7727d5d3fc694f2fd9ad554bdb8af9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE2 10756 bytes