Malicious PDF — malware analysis report

Static analysis result for SHA-256 431bc3dea4503388…

MALICIOUS

PDF

50.2 KB Created: 2020-08-27 17:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f171b1aa4d5b419c14857ddc257c3040 SHA-1: 2cfa893a5243aa0dca10af9775814c1401b415b4 SHA-256: 431bc3dea4503388c92a7b529d79b617f1ad0d08e9ad2c14874e540668b8ec23
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.club, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the URL and appears to be a lure related to a book title. The ML classifier strongly indicated maliciousness, and the PDF structure itself contained a mass external link farm, further supporting a malicious intent.

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.club/pify?keyword=the+zen+of+listening+rebecca+shafir
    • http://files.northcentraldocs.com/uploads/1/3/1/4/131453429/53d758a.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/rufetusuvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/embed_in_google_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/69512116634.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0432/1122/7300/files/kuvak.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/27735533523.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gefoviliruvowej.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6206/files/bovokibulapobeguguxat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85986419962.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/33168382819.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/27814248281.pdf
    • https://cdn.shopify.com/s/files/1/0447/8212/5205/files/dieta_celiaco.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/27725598245.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/depugug.pdf
    • https://cdn.shopify.com/s/files/1/0433/8964/9054/files/pujatapefudine.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_off000078ff.bin
9212bfe3eb8b95e96182e1126a6544324482dee9e95452f688e10276c0ef7cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78FF 5072 bytes
font_01_sfnt_off00008a38.bin
1f18a13f28d264f3d3fb5a1f9b0db72fbccddcedd2e241dc3c749db7f48e8e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A38 10368 bytes
font_02_sfnt_off0000adab.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADAB 4324 bytes

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