Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bbbea2fef455a6…

MALICIOUS

PDF

44.0 KB Created: 2020-09-03 09:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9c7fcaf6ad71dc195267f5215d1208a SHA-1: 5ce161811adf2ada616e92a1bf2f3f190b2b2ebf SHA-256: 64bbbea2fef455a61a22a569c9b518101068d4b7bd979827043d268c3a6547ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically 'ttraff.me'. The document body, though heavily obfuscated, contains text related to 'arithmetic worksheets year 1' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of numerous other PDF links, many pointing to Shopify, indicates a potential link farm or SEO manipulation tactic to distribute 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.me/pify?keyword=arithmetic+worksheets+year+1
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0466/4999/9525/files/67379582215.pdf
    • https://cdn.shopify.com/s/files/1/0460/3432/1572/files/delonghi_dragon_safeheat_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/pixovefiv.pdf
    • https://static.usrfiles.com/ugd/c83fdb_7acbcefbed654da88b6e166123be5a06.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_0471f702132d4c87aad83371ffabe7e4.pdf
    • https://static.usrfiles.com/ugd/72b0e7_37a9ec0f4ae34715902983a38af5be9b.pdf
    • https://static.usrfiles.com/ugd/93971e_baa24737a64e4a5a91b498707d7ec171.pdf
    • https://static.usrfiles.com/ugd/96a426_2e99875e3f3b43a9bdb6566039851bf4.pdf
    • https://static.usrfiles.com/ugd/804ff6_8e217aafd92c4429be246073fc338bc6.pdf
    • https://static.usrfiles.com/ugd/3f80ec_e7ff65deae2340c39744e7c27a47666e.pdf
    • https://static.usrfiles.com/ugd/b8c837_353b0119927641cb82803edbdeb8fc6f.pdf
    • https://static.usrfiles.com/ugd/d1c05f_7b2879200e0d489d8258c892115ebe3e.pdf
    • https://static.usrfiles.com/ugd/3615fb_c08a34910d794dd7b08ecd467405346b.pdf
    • https://static.usrfiles.com/ugd/07ef24_9a02357bc7304d3d9422fdb3df3318f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c5db20b1182413285f81f951a5e9a2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_455a584b94004138aa98c8a6f45a74d0.pdf
    • https://static.usrfiles.com/ugd/60933b_98e9e08e24414b74a6ff23e82e85635b.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006edb.bin
3a4c9a3272fcbf531702f2e5831ac8854c7dd536a8ccff4929d1a76d4cf339ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDB 5308 bytes
font_01_sfnt_off000080d5.bin
67b3753a003b0e2d8fdbecbea244d483c5a288d68a4e2402dd8e55e15cb8dd51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D5 10044 bytes

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