Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d3d092721df1ec…

MALICIOUS

PDF

46.6 KB Created: 2020-08-22 19:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2239fcad0b3756d536cd966c4d43ee0 SHA-1: d4e953997f67543038c270076085c03fa10a3fe5 SHA-256: 81d3d092721df1ec4646d131915f7af8f7efe9611038af063130717842142ab1
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is presented as a 'chat app for android tutorial'. This indicates a phishing or malware distribution attempt. The document also features a large number of links to external PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=chat+app+for+android+tutorial
    • http://files.gracechristianmusicfestival.com/uploads/1/3/1/4/131437956/modovudigakejel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/5883/0231/files/libubuferitevajonoren.pdf
    • https://cdn.shopify.com/s/files/1/0433/3171/5225/files/inverse_derivative_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9670/files/88791263809.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/wusibapo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9514/6139/files/almidon_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0447/5292/8919/files/css_display_inline-_block.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/58336243773.pdf
    • https://cdn.shopify.com/s/files/1/0438/2484/0861/files/pradhan_mantri_atal_pension_yojana_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/bucket_elevator_capacity_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0428/2499/0887/files/25684380706.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c77.bin
10f83f9a49ce3ea99cb8ab8b73e33704942c2d84cc5c9e83f3a4cc5e528d7b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C77 4736 bytes
font_01_sfnt_off00007c7f.bin
54d77279a9c24caa12561f89ec518ed9e4cdce9131eeb337a1a840fbf8abaa07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7F 10292 bytes
font_02_sfnt_off00009fca.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FCA 4324 bytes

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