Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f58a932832444a…

MALICIOUS

PDF

64.6 KB Created: 2020-09-21 03:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22cb5ef6793776b84c287473b5da9c31 SHA-1: 8ed847f2903f8eec6d15a68f3fa09c6f2164e248 SHA-256: 16f58a932832444a9e1b6dbf5a4fd3ef92b5347e278fea251e739e29f96a24e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external PDF files, a common tactic for SEO poisoning and distributing malicious content. One of the embedded links, 'https://ttraff.me/wix?keyword=mega+man+x3+strategy+guide', is identified as a known malicious redirector. The document body, though partially corrupted, also contains this URL, suggesting an attempt to lure users into clicking it. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=mega+man+x3+strategy+guide
    • http://files.cochranhomeinspections.com/uploads/1/3/2/8/132814342/winukaputi_nepebapenipumel.pdf
    • http://votosum.taiwancarparts.com/uploads/1/3/0/8/130814173/pajalafuzovagi.pdf
    • http://difolaxiw.thefashionablefarmgirl.com/uploads/1/3/0/7/130739197/ropobokadedibib.pdf
    • http://sakej.yesseniacalderon.com/uploads/1/3/1/3/131381924/debixuwa.pdf
    • http://files.roseswithoutthorns.net/uploads/1/3/0/7/130775647/df950b23.pdf
    • http://kulopazi.harvardgapyearsociety.com/uploads/1/3/1/4/131408229/9181890.pdf
    • http://xejore.ciumontreal.com/uploads/1/3/0/7/130776436/reradejixofe.pdf
    • http://files.rodrigoforhire.com/uploads/1/3/0/7/130739616/tonazezinum.pdf
    • http://tilaw.mooliday.com/uploads/1/3/2/3/132303382/kijoduxevaj_poxusibaturaxad_tojijajoxitade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4793b225-0519-4bed-a323-b760ac3ac05a.filesusr.com/ugd/15cd4d_576e126cd5654e39bb0a47ec70b92261.pdf?index=true
    • https://7df5c048-7b2e-4bc2-a637-c9b73b4ea26b.filesusr.com/ugd/1813b3_ab84061b11e64c1db92f65f85065593a.pdf?index=true
    • https://640cd9ea-9543-444a-9bda-863db11e69ee.filesusr.com/ugd/ee6770_0d48e6435c5649838202bd4ee5e5e98b.pdf?index=true
    • https://e4750a86-bb87-4ac3-9d96-33915e57d0d3.filesusr.com/ugd/4cf28d_57785ceb011948c1a9c4efc77d8521e6.pdf?index=true
    • https://9b645a08-30b0-47e3-bf5d-35e163c512d1.filesusr.com/ugd/5bb01c_90556416ea2949a2b3e2690d54a50608.pdf?index=true
    • https://cc116794-1dd6-4ca7-afed-25396e233898.filesusr.com/ugd/238140_f852b233813845718bbde36d48a42610.pdf?index=true
    • https://85e73827-7598-44b6-bb57-0efad31fada1.filesusr.com/ugd/74a852_8ba4b7433c44481b92fded11a6ecf30c.pdf?index=true
    • 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_off0000bf53.bin
c2726b1dc7e514c7739b0eb615d1c7124210b7f4aebb8950590c9bb7dc1ab0a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF53 5452 bytes
font_01_sfnt_off0000d1df.bin
cac52e74f26838ee96fadf6b3802f151c8bacbcb8b26a0d7c6aebe7827152c57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DF 10516 bytes

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