Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ff46ba3174f70e…

MALICIOUS

PDF

56.9 KB Created: 2020-08-31 01:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49096bd04078897c6d564ba15cd05bfc SHA-1: 317ea4c6600cdcc14430b8e35ab018762e16ff4d SHA-256: 13ff46ba3174f70ed703b3dec1de191ce97df977538d18a84f32b1272de50d21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure victims to malicious sites. The primary malicious URL identified is https://ttraff.ru/wix?keyword=nj+all+state+choir.

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=nj+all+state+choir
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/df4650_6de0dfd654324e3e97543e48cb941f0e.pdf
    • https://static.usrfiles.com/ugd/f459ea_d3c7ea80e4c54a48baf9b2cb57548c99.pdf
    • https://static.usrfiles.com/ugd/cd79e3_f587c41e33744f93926fb401cf7dd637.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f92c65d7a024e6a8718f26566f71acb.pdf
    • https://static.usrfiles.com/ugd/b8c837_01d9be52db3f48eb85dce203f68a2ad5.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/calculate_retained_earnings_in_balance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/aoe2_validating_subscription.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/83887442867.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/tirafosugosironinutur.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/92854956065.pdf
    • https://static.usrfiles.com/ugd/b8c837_192aec1e518749cf8e0281c712378abd.pdf
    • https://static.usrfiles.com/ugd/b8c837_29b7b00f22784d17b0900dcefed3238d.pdf
    • https://static.usrfiles.com/ugd/b8c837_11c5cb2b2c044443ab22ef78c347c63f.pdf
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/26277644434.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9578/files/basic_pencil_drawing_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0440/3301/5958/files/bapipunomoxoli.pdf
    • https://cdn.shopify.com/s/files/1/0437/3043/6247/files/314005589.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7097/files/20977702849.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ac11.bin
95ba3edd115e1a3f201cfd8fabd9670c710f532ebb2e01c31b8dec1892c2094b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAC11 18176 bytes
font_00_sfnt_off00006c85.bin
fad9d25c156878bf5522bf2ea9839c3775b079edc00f1e06f6a1062d34ec9f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C85 4616 bytes
font_01_sfnt_off00007c40.bin
1058cd2f498191682fe717918e347407b24256d185d29eae436dfb995ab09ff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C40 15336 bytes
font_03_sfnt_off0000c840.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC840 4324 bytes

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