Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9742769c7fd812…

MALICIOUS

PDF

48.4 KB Created: 2020-07-16 20:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eafa208430a7d10676687a961634ff8 SHA-1: 91810c1cb1d2bdbd57004483d3043ccc32a99885 SHA-256: 3b9742769c7fd812c7bbcc54a292942cc8e73ccdf9bb0a47ed3f3da470b8169a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links designed to redirect users to malicious websites, masquerading as legitimate technical document downloads. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates a direct link to known malicious infrastructure, specifically 'ttraff.com'. The 'PDF_SEO_LINK_FARM' heuristic further supports this by identifying a large number of external PDF links generated for SEO purposes, aiming to attract unsuspecting users. No scripts were extracted from this sample, but the extensive link farm and redirector usage strongly suggest a phishing or malware distribution campaign.

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.com/wb?keyword=cmos%20digital%20integrated%20circuits%20analysis%20and%20design%20pdf%20free%20download
    • http://files.dwightspaulding.net/uploads/1/3/1/3/131379801/7109576.pdf
    • http://files.offthewallireland.com/uploads/1/3/0/7/130739126/karumumipi_vidanovaw_jugagukixisa.pdf
    • http://files.pn-projectmanagement.com/uploads/1/3/0/7/130776118/4909167.pdf
    • http://files.tasmanianpolarnetwork.com/uploads/1/3/0/7/130740166/1360436.pdf
    • http://files.newtongeorgiadems.org/uploads/1/3/1/3/131397960/zizebadipi_wuwatonevapo_julemufevosizi_tijumina.pdf
    • http://files.offthewallireland.com/uploads
    • https://zezumova.files.wordpress.com/2020/06/xubixotowezovenutek.pdf
    • https://jezasexezo.files.wordpress.com/2020/07/25983685861.pdf
    • https://kuramajibi.files.wordpress.com/2020/06/73884200938.pdf
    • https://jaxitaxi.files.wordpress.com/2020/07/6591766119.pdf
    • https://mewulatej.files.wordpress.com/2020/06/848026764.pdf
    • https://pasudekotil.files.wordpress.com/2020/07/gigotixowuri.pdf
    • https://serifutaje.files.wordpress.com/2020/07/manakumuxuxawup.pdf
    • https://zutakedolap.files.wordpress.com/2020/07/mizedefafazagukigu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/65120872535.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/padimawedagovuju.pdf
    • https://cdn.shopify.com/s/files/1/0429/0818/8839/files/tojipiside.pdf
    • https://cdn.shopify.com/s/files/1/0432/2151/6448/files/15297256620.pdf
    • https://cdn.shopify.com/s/files/1/0430/8520/1561/files/17540986394.pdf
    • https://cdn.shopify.com/s/files/1/0430/7668/1882/files/62990144693.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7394/files/70334887315.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fc8.bin
9eff77d45f2ed630a493b7e986a3afc488321f17a1a56eee9e7b18b87c5adff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC8 5572 bytes
font_01_sfnt_off000082b9.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B9 2116 bytes
font_02_sfnt_off00008c83.bin
34f0f25ac3fe718af561902db961cbf451fc70e6a453877a2057640c103b8101		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C83 10752 bytes

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