Malicious PDF — malware analysis report

Static analysis result for SHA-256 842f8ce88e3bad4c…

MALICIOUS

PDF

42.2 KB Created: 2020-09-01 03:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2f0044b65804767ad8c8779853a206e SHA-1: 1f75654f8fcd80f3f2d1e382c7af575971d22e84 SHA-256: 842f8ce88e3bad4c60c7944e430d6163681e650de5e32ef97b0c9581f25afc70
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=free++template+powerpoint+technology'. Another heuristic indicates a large number of external PDF links, suggesting a link farm. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to 'free template powerpoint technology', aligning with the lure used in the malicious URL.

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.cc/wix?keyword=free++template+powerpoint+technology
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/278743_634f30de14374c9096f52b499efee2d2.pdf
    • https://static.usrfiles.com/ugd/217d68_b95a09de58164a149a0d7f1b3fffd469.pdf
    • https://static.usrfiles.com/ugd/dd6616_a4a81a570f0743e99d6087597cbce441.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed90f2a3be8542cda28f486d9cbf2f16.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4455/files/nueva_piramide_alimenticia_2020.pdf
    • https://cdn.shopify.com/s/files/1/0454/6537/0782/files/datepicker_date_format_react.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/3461128781.pdf
    • https://cdn.shopify.com/s/files/1/0461/8344/8730/files/66358066062.pdf
    • https://cdn.shopify.com/s/files/1/0440/1417/4358/files/vironaduvegijaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6850/5766/files/pegaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69262577592.pdf
    • https://cdn.shopify.com/s/files/1/0437/0789/1863/files/wedomigiwusiwovuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/5947/6630/files/kegubibelaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/9944/5664/files/rachael_vs_guy_celebrity_cookoff.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b1e.bin
bd3e175b2910f8ef3f41b01775a74086446b81ffad1d6a438a55e5afb682204c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1E 5108 bytes
font_01_sfnt_off00006c5b.bin
070f7f452b43d6f09983bd7e92ea1a32e19e38efa4e08825d4220a710715bc1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5B 9808 bytes
font_02_sfnt_off00008dea.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEA 4324 bytes

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