Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77d14b1879fa57b…

MALICIOUS

PDF

64.2 KB Created: 2020-08-31 04:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09642b7c49aa58026c7ee11d0831d6c6 SHA-1: 7277f89423a7e536274381e4302085e302b28a3f SHA-256: f77d14b1879fa57b7896ca4229c04a7463a0faff105b09ffbd0eec48f00a2ed9
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=strelok+ballistic+calculator+for+iph'. The document body appears to be heavily obfuscated or corrupted, but the presence of numerous links, many pointing to Shopify domains hosting other PDFs, suggests a link farm or redirection scheme designed to lead users to malicious content.

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=strelok+ballistic+calculator+for+iph
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/8084864013.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/gezize.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8178/files/85260041841.pdf
    • https://cdn.shopify.com/s/files/1/0433/1939/4462/files/rakitadopup.pdf
    • https://cdn.shopify.com/s/files/1/0436/8846/0441/files/alt_code_bullet.pdf
    • https://cdn.shopify.com/s/files/1/0438/5207/1074/files/23706423518.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/67451465393.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/92789307559.pdf
    • https://static.usrfiles.com/ugd/a771bd_78d198cb5f3f4ceb8c73cd4a20f6f035.pdf
    • https://static.usrfiles.com/ugd/97aff7_26ae3dd6fe3d4a35b991653b5d711998.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/zifemirugomafimilaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5458/0391/files/44389501422.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_off000097b3.bin
396f40e562fe21c9994c9b021504024ac4c4c34b7abc7be943f810358cdee133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B3 5188 bytes
font_01_sfnt_off0000a969.bin
571c3efebcf62ad6cef144c76d5af34c7356a2264156180872fa3d20b3b82571		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA969 11312 bytes
font_02_sfnt_off0000d036.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD036 16312 bytes
font_03_sfnt_off0000e5c1.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 4324 bytes

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