Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa6f66fa2d27fd7…

MALICIOUS

PDF

45.2 KB Created: 2020-08-10 03:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3b3ba75d0b4349106a6aab80a2f5a20 SHA-1: 71cc7ed5be351bc3df9dd303174cd8b00eda4ca7 SHA-256: 5aa6f66fa2d27fd7c6a57c49b77123131f09f4047291294743387e4290788c1b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, but one critical link redirects to `ttraff.com`, identified as malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to "Auto mechanics for dummies pdf" and the malicious URL, suggesting a lure to download potentially harmful content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to malicious sites.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=auto+mechanics+for+dummies+pdf
    • http://files.vicenzas-crostoli.com/uploads/1/3/1/4/131483253/9062675.pdf
    • http://files.cuauhtemocmurphy.com/uploads/1/3/1/3/131383973/7e15cab958a26.pdf
    • http://files.falconhillbz.com/uploads/1/3/0/7/130776864/df707c99d603f.pdf
    • http://files.newworldtribe.us/uploads/1/3/1/8/131871537/foravifesori.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/badomoxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4791/9516/files/advanced_mathematical_concepts_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/big_al_s_menu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/arduino_programming_reference.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/gijodepadezudok.pdf
    • https://cdn.shopify.com/s/files/1/0429/9256/6435/files/ca_dmv_bill_of_sale.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4920/files/darusabak.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/1516836780.pdf
    • https://cdn.shopify.com/s/files/1/0431/6413/9674/files/46884106966.pdf
    • https://cdn.shopify.com/s/files/1/0438/2267/8173/files/mafupelutevepanenemumori.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3323/files/features_of_bhakti_movement.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2628/files/rejolodonewema.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_off00007244.bin
dfacf24949608b4aaeab96946d1c4389f4b115abbf9fc6794e1dbfb72542c354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7244 5352 bytes
font_01_sfnt_off0000844e.bin
ffc4d3bfc4b790f8b17da492d230c9a47f5bdcc0f24f34fd567ad7df6b7e5f5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x844E 10352 bytes

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