Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d27288affe28296…

MALICIOUS

PDF

81.2 KB Created: 2020-08-14 01:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ac204e5b7e947ea67f8d800b1b68620 SHA-1: 2f4ef0034f795525149906ac983d6f6343890e01 SHA-256: 6d27288affe282961a380e92d874cecf2de20309e223a0a560a489f86317bc30
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'Kirchhoff's current law worksheet'. The presence of a large number of external PDF links suggests an attempt to manipulate search engine results or distribute further malicious content.

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.ru/wb?keyword=kirchhoff
    • http://pojoxa.vkinspections.com/uploads/1/3/1/4/131482823/nudibebudesunaki.pdf
    • http://files.valeriaflorescano.net/uploads/1/3/1/4/131454106/fesizotogopoduf_fugopisivamu_dawivolokixi_kapopazare.pdf
    • http://files.mvkey.org/uploads/1/3/1/6/131606819/b5947885.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/tapitixomotofudexatavitog.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/rugrats_royal_ransom.pdf
    • https://cdn.shopify.com/s/files/1/0432/8875/6374/files/dupejegapegijefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/27856270528.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/dovume.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/how_to_delete_a_slack_channel.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/4804518409.pdf
    • https://cdn.shopify.com/s/files/1/0431/8491/4583/files/wefawev.pdf
    • https://cdn.shopify.com/s/files/1/0429/8306/3715/files/39039691036.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/34150299094.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7645/files/tuvebisa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaac.bin
23539d2a634b0f20135357eb0c499efb961d2c379bff3da1c27768f5337088e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 5008 bytes
font_01_sfnt_off0000fbb6.bin
7483df6dbe7249c956b2062e7615e03d8c46abcd2dd08081a9ad3d8dc82f6bba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 2192 bytes
font_02_sfnt_off0001050d.bin
f6cd444319a01096ac77061c36e12d236f9164083e1b84832112edcc7c5257b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 10520 bytes
font_03_sfnt_off000128c8.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 4324 bytes

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