Malicious PDF — malware analysis report

Static analysis result for SHA-256 73897e87921afdd9…

MALICIOUS

PDF

61.8 KB Created: 2020-08-03 09:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13f7f70d3041307bbdc989955eafc8ae SHA-1: ad0a56a5a9d5fb96e1b5805bdb6e4c41af0138de SHA-256: 73897e87921afdd92e4e2d4eedaf05a32c94fb630bbfa0ab6f67bd17b78e5151
162 Risk Score

Malware Insights

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

This PDF file contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document also features a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or a method to distribute multiple payloads. The presence of a 'download' call-to-action further supports the malicious intent of luring users to download files.

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=pbe+download+league
    • http://files.sallyfort.com/uploads/1/3/1/4/131437725/niweniniremiledolov.pdf
    • http://files.puddlesandrainbows.org/uploads/1/3/1/4/131408209/e4618981.pdf
    • http://files.pjobrienbmx.com/uploads/1/3/1/3/131383630/540258.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5462/7993/files/fuxakeronajava.pdf
    • https://cdn.shopify.com/s/files/1/0438/1619/0112/files/glittering_generalities_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/wivipabinezugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7840/1700/files/debavoserutunulupazilaja.pdf
    • https://cdn.shopify.com/s/files/1/0438/2438/2109/files/bajitukaduzobano.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1369/files/zepobi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3733/files/lmm_duramax_problems.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/43117646549.pdf
    • https://cdn.shopify.com/s/files/1/0436/2564/4192/files/31480569924.pdf
    • https://cdn.shopify.com/s/files/1/0429/4692/0615/files/bemonevafagivusizupematun.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/rilep.pdf
    • https://cdn.shopify.com/s/files/1/0437/4305/1937/files/babetiganakif.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_off00006e66.bin
71da3b94f62f76be46fc091e7485fa90426b9605e8528f988fc0f1bc8b604f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E66 22420 bytes
font_01_sfnt_off0000af2e.bin
ac79a3c06dbc339eb3a4689503f70ec57e77810b3b3d7e5349364e0d4a5371f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2E 4952 bytes
font_02_sfnt_off0000c031.bin
5cbdd05032403ca89bb6c60a9b5b5b6387b6946671a37dc343f58bbf6241c9a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC031 12952 bytes

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