Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c6c34e9b71fd7c…

MALICIOUS

PDF

35.6 KB Created: 2020-09-03 11:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04da78faaaef0e7d7b4549514991c700 SHA-1: cc7752887172d9b6725f129088539c6cef361b03 SHA-256: 87c6c34e9b71fd7cd49181b9150c0f8344fdb190e38ceda724e374facc14d05f
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially obfuscated, mentions 'Doraemon cartoon hd wallpaper' and includes a URL that appears to be part of a link farm strategy. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL used to lure victims.

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=doraemon+cartoon+hd+wallpaper
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8c0e65_65b93c3d8d544db2a2ba3f95aef6194d.pdf
    • https://static.usrfiles.com/ugd/b8c837_49773783d9b1483f950c79338b3366ba.pdf
    • https://static.usrfiles.com/ugd/85c99c_f225d463543d4fc1a3aeb63c7aedf546.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_4d22a09da47a40689f6f737b7c31b1ce.pdf
    • https://static.usrfiles.com/ugd/2486b5_c5e7a83a80e34e458ba76952b4177374.pdf
    • https://static.usrfiles.com/ugd/4b7290_33afaa99b78b4791b7230a75a103089f.pdf
    • https://static.usrfiles.com/ugd/ab922d_80438a621dc545599674cc5380b5beab.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8c547cbf4ad45df9bf4e94c2775807b.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3281/files/lijorejidinawemife.pdf
    • https://cdn.shopify.com/s/files/1/0465/0870/3894/files/99109722461.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6929/files/pencil_shading_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0447/5830/2869/files/agriculture_biodynamique.pdf
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/jawiketulejusojexafunuvul.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/8989746292.pdf
    • https://cdn.shopify.com/s/files/1/0432/7528/8732/files/nafiputeja.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0186/files/64581672041.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/anagyris_foetida.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_off00004e1c.bin
de9fbef4566e0d2b3c9337f9a821691f0f3ee10693c9fc1506370c784853dc12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E1C 5224 bytes
font_01_sfnt_off00005fc8.bin
5791fcb9c978c196361bf9fb769d375e0479107f4d952daf9fea65bedbeba432		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC8 9820 bytes

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