Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d2841bb8260a85…

MALICIOUS

PDF

44.6 KB Created: 2020-08-14 03:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b62e117c85e768359fd9643a9e20dac SHA-1: ca3848c1aac51a93dd0255ebd38ab7ad126ae465 SHA-256: 65d2841bb8260a85fb212494ad9bcdf37b7d544c985550c475c30035baad3399
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a malicious redirector (ttraff.com) disguised as an academic routine document. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or SEO spam. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wb?keyword=assam%20university%20routine%202019%20pdf
    • http://files.hofflerhypnotherapy.com/uploads/1/3/1/8/131857914/bogenukimibadi-jovarum.pdf
    • http://files.paoloiarussi.com/uploads/1/3/1/3/131384136/rinezopu_wiwaram_kizafuga.pdf
    • http://files.nurturedbirthservices.com/uploads/1/3/0/9/130969545/8e3366b0d399.pdf
    • http://files.rambestproperties.com/uploads/1/3/2/3/132302963/4363480.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/0198/4662/files/17048743612.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/41361789230.pdf
    • https://cdn.shopify.com/s/files/1/0432/1797/7504/files/rains_of_castamere_sheet_music_piano.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/tovuduvoruvimu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9187/0375/files/jepefigugalawuboba.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/loxuribojudo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4870/files/78145874507.pdf
    • https://cdn.shopify.com/s/files/1/0432/3534/4539/files/55385186752.pdf
    • https://cdn.shopify.com/s/files/1/0437/7182/2229/files/72685132093.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.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_off00006e56.bin
b1aa26070c147a4659287ff8d47fb6f4fbbfb396eb578eb364aff23a4863ba8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E56 5788 bytes
font_01_sfnt_off000081ff.bin
63e0d384ef483e63fe72196a769fdcee13afbaef17d0678eaff458ed2ee20697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81FF 10772 bytes

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