Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f87cb8a542c152…

MALICIOUS

PDF

33.6 KB Created: 2020-08-31 12:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b99e79a6950fbc5e5b085710b49b5e10 SHA-1: 04b6c09597f3610034e2bfd7cb3acdb0e1b3b63a SHA-256: 46f87cb8a542c1524c0c074f70f7cfab0fed4cba875ddee9fec7cfefa7b0ae1c
150 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 to other PDF files, many hosted on Shopify. One of these links, 'https://ttraff.ru/wix?keyword=splat+and+the+cool+school+trip', is identified as a malicious redirector. This suggests a tactic of hosting malicious content or redirecting users to malicious sites through a link farm. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wix?keyword=splat+and+the+cool+school+trip
    • https://cdn.shopify.com/s/files/1/0431/8029/4298/files/fitadopexez.pdf
    • https://cdn.shopify.com/s/files/1/0431/0715/6128/files/supplementary_budget_2020_zimbabwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/adjective_noun_verb_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4495/files/beyond_the_sea_song.pdf
    • https://cdn.shopify.com/s/files/1/0437/3656/3866/files/warframe_jordas_golem.pdf
    • https://cdn.shopify.com/s/files/1/0428/8725/0087/files/list_of_cities_in_america.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4691/files/9349741940.pdf
    • https://static.usrfiles.com/ugd/22bf55_5fed0011d199474597059e65a2c93fd4.pdf
    • https://static.usrfiles.com/ugd/3bca44_dfd553e2271c421ca0e533db2afff22f.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/51245807915.pdf
    • https://cdn.shopify.com/s/files/1/0431/2258/9853/files/draw._io_family_tree_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/6297/6921/files/44073182265.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_off0000469a.bin
ab2e533af63bfb58a9e2c21df805dd7f3aff3b020d53a6649901208f0c361346		 pdf-font-stream PDF embedded font (sfnt) at offset 0x469A 5264 bytes
font_01_sfnt_off00005866.bin
13ec403a29ca981d8f09bcf476d3b3121966e764f6d6cbc9dc5844c8bb6d43ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5866 9736 bytes

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