Malicious PDF — malware analysis report

Static analysis result for SHA-256 d270d309083f9119…

MALICIOUS

PDF

33.9 KB Created: 2020-08-22 13:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b332f81d90f02a18ecbac13d8cfe9801 SHA-1: 7ddfbbe83d153a57e302c4c2c4d02cac867171e6 SHA-256: d270d309083f911972d86e92e0b0eb4de1af20f0fe06ca895de50cf652094ba3
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Introductory chemistry study guide answers' and the malicious URL, suggesting a lure. The presence of numerous embedded links, many pointing to Shopify domains hosting PDFs, indicates a link farm strategy, likely to obscure the primary malicious destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=introductory+chemistry+study+guide+answers
    • http://kotovi.orfeonportuense.com/uploads/1/3/2/7/132710621/3109153.pdf
    • http://files.updatescentral.com/uploads/1/3/1/3/131384018/fotimiva_nidanu_gibuvidedavade.pdf
    • http://kosezap.nancymaldonado.com/uploads/1/3/0/7/130775062/6325edac.pdf
    • https://cdn.shopify.com/s/files/1/0440/6837/2632/files/xumunolupometeli.pdf
    • https://cdn.shopify.com/s/files/1/0448/2285/5837/files/free_bunco_score_sheets_word_document.pdf
    • https://cdn.shopify.com/s/files/1/0430/8254/7361/files/4355278353.pdf
    • https://cdn.shopify.com/s/files/1/0430/8018/8058/files/suzuki_eiger_400_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/89486136393.pdf
    • https://cdn.shopify.com/s/files/1/0429/1480/7974/files/worigixafafulitipemu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/banned_movies_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/27939165967.pdf
    • https://cdn.shopify.com/s/files/1/0436/3180/4574/files/gitenugojoxix.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/xubigufinubet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/60039621733.pdf
    • https://cdn.shopify.com/s/files/1/0448/7554/6791/files/bathroom_fittings_price_list.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045ec.bin
720ff851f6b946c148cfc81e2c8a52ac81aa296444ddba295792c8fb12171206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45EC 5452 bytes
font_01_sfnt_off0000585c.bin
92192a92037acd0ccc407e568a371930d753ebd1c8b8b38417a1bd53c72d4169		 pdf-font-stream PDF embedded font (sfnt) at offset 0x585C 10136 bytes

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