Malicious PDF — malware analysis report

Static analysis result for SHA-256 762fcf7cab9b1fe9…

MALICIOUS

PDF

55.0 KB Created: 2020-09-11 02:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf56a78856c4ed199b92a67714521941 SHA-1: e2f646538bf884a868e0207a4dd6e160328d1a1d SHA-256: 762fcf7cab9b1fe906c187bd3ad5d1f6e452df340c867a972f5f649b37e3177c
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure. The presence of a 'download button' lure further supports a malicious intent to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/wix?keyword=debt+snowball+worksheet+for+numbers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/46a5ae_ee5d21a4bc5645aa923099292847ae34.pdf
    • https://static.usrfiles.com/ugd/3d0627_0986092bc4ef42f0b9c9943d030282d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1b09fe3458b4864bedc3aacab44d508.pdf
    • https://static.usrfiles.com/ugd/7ab50f_234aa4cf49f84e27b69e5f6e91538970.pdf
    • https://static.usrfiles.com/ugd/23924c_d02dd69cd21e4670a8ad73b79a3c4db3.pdf
    • https://static.usrfiles.com/ugd/b6aaa0_5a83361a3bf04db39e86a9223d5e1d50.pdf
    • https://static.usrfiles.com/ugd/ed64d2_c2c202aff949461f917f02b2fdd07f97.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_58169474ded6434c975831872303770a.pdf
    • https://static.usrfiles.com/ugd/314c35_85abe69e88864b91837345f934e81c3c.pdf
    • https://static.usrfiles.com/ugd/e3325f_201c128aae3f4455b6d83aa117b01f1b.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/20334717140.pdf
    • https://cdn.shopify.com/s/files/1/0439/2543/8619/files/para_vidya_and_apara_vidya.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/creepy_carrots_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/past_simple_versus_present_perfect_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/varumupebixalozojin.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/66126118274.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/98735164152.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_off0000987f.bin
f81852218099d2ffb4606ceed7e3fc42252fc1216988601a04e3a562daa24d71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x987F 5304 bytes
font_01_sfnt_off0000aa76.bin
f39075f8faa6da9aa273150781ec3d3f6402110287c628cb416d3be9ae3a5b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA76 10592 bytes

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