Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7982d9878b81cc…

MALICIOUS

PDF

82.4 KB Created: 2020-09-09 16:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f689842be8706a21bb7da70761e1706d SHA-1: e4cbdfb61cf60eda53e8f952438c99b50fbdb3df SHA-256: fe7982d9878b81cc4a4b509049e652cf62972ffcbe091c8db30d24926ca13f7a
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/wix?keyword=bangladesh+army+picture', is flagged as a malicious redirector. The document body, though heavily corrupted, contains text fragments that appear to be related to 'Bangladesh army picture' and the URL itself. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm or redirection strategy. The ML classifier strongly indicated 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.com/wix?keyword=bangladesh+army+picture
    • https://static.usrfiles.com/ugd/98d639_882e9b12a07a46058a8c2c5b4146e8e0.pdf
    • https://static.usrfiles.com/ugd/bca722_5fbf1647b55c4a52a321d9c91bf11130.pdf
    • https://static.usrfiles.com/ugd/b8c837_82af11890f774fe18371512c7932ec58.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1dbbfb8f8a042a18d05d0f8565bf543.pdf
    • https://cdn.shopify.com/s/files/1/0432/5815/1072/files/adobe_premiere_pro_cc_2020_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/8741/9805/files/pathfinder_horror_adventures_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/bagifiru.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/83195740094.pdf
    • https://cdn.shopify.com/s/files/1/0443/9041/6550/files/artificial_intelligence_techniques_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0439/6577/6030/files/asic_form_appointment_of_authorised_representative.pdf
    • https://cdn.shopify.com/s/files/1/0428/6457/4620/files/96822573455.pdf
    • https://cdn.shopify.com/s/files/1/0431/5227/7670/files/government_bursaries_application_forms_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/mike_tyson_s_punch-_out_characters.pdf
    • https://cdn.shopify.com/s/files/1/0457/8630/0572/files/capillary_electrophoresis_methods_and_protocols.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d432.bin
9f37a91e71dd31545d50c1428ad822a77ea7c11765f3f936fe5117efd607b167		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 5408 bytes
font_01_sfnt_off0000e669.bin
8538c6910e1d5f1bfc97426d9e55a3e2479c44ff08bb3998a1c33b959bc5cb1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 10820 bytes
font_02_sfnt_off00010910.bin
d509e78916190afe79e1c9e337ee2a9c5bba76182e7adcb87f0069464a2825a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 10808 bytes
font_03_sfnt_off00012c8b.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8B 4324 bytes

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