Malicious PDF — malware analysis report

Static analysis result for SHA-256 3988075c67db3c3e…

MALICIOUS

PDF

48.6 KB Created: 2020-08-20 23:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c612c50489da56ee9bd9839093f80988 SHA-1: 43efb01bf6b3fa2d65587ff5e0332dea787619b1 SHA-256: 3988075c67db3c3e767e3c9232d164a40c5abf084e8a9ce60fcfb8f849532199
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a keyword search for 'acrylic plastic sheets for sale'. The document also functions as a link farm, pointing to numerous other PDFs hosted on Shopify, likely to improve search engine ranking and distribute malicious links. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms the intent to lead users to harmful 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.com/pify?keyword=acrylic+plastic+sheets+for+sale
    • http://kopoxax.yellowsubdownunder.com/uploads/1/3/2/7/132740748/tifaze_jezusilu_gowevi_fagijabikur.pdf
    • http://files.anandaaromayoga.com/uploads/1/3/1/3/131383657/nogamabemi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4528/1183/files/lumowutur.pdf
    • https://cdn.shopify.com/s/files/1/0435/2193/3466/files/bokidavebedoluwa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/california_eviction_defense_manual.pdf
    • https://cdn.shopify.com/s/files/1/0448/4068/1633/files/matrix_color_chart.pdf
    • https://cdn.shopify.com/s/files/1/0438/4735/2480/files/radidoki.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/54875278147.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/79487425228.pdf
    • https://cdn.shopify.com/s/files/1/0439/3785/7691/files/academy_stars_5_pupil_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/keto_menu_plan.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_off00007dc3.bin
d2f76d55ce1049681e0c33fcc629e5396bc5bd7dca6bd2b23618bf48d085a5a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC3 5192 bytes
font_01_sfnt_off00008f6b.bin
88934fe798e5b7c3a1ae442e86a69eacbf0da1d51fb9c8c183d6ce9557c6095a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6B 11384 bytes