Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a71d62fb0d532e…

MALICIOUS

PDF

45.6 KB Created: 2020-08-15 15:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d42c23b00203708e4e4f616100effacb SHA-1: ce81ba1191ada9a03569ce9bf66a34f4622a2129 SHA-256: 61a71d62fb0d532e3d411e06555356604690e793aae49404fae2aa0424553716
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to a 'UK shortage occupation list'. The presence of numerous other links to PDF files hosted on Shopify suggests a link farm or SEO manipulation tactic, potentially to obscure the malicious redirector.

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.ru/wb?keyword=uk%20shortage%20occupation%20list%202017%20pdf
    • http://files.bsdcouture.shop/uploads/1/3/0/8/130814043/dosologunesad-luzutifori.pdf
    • http://files.scsaints.com/uploads/1/3/1/4/131437649/8916663.pdf
    • http://files.embassyrow-properties.com/uploads/1/3/0/7/130739450/6889841.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/38966938356.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0250/files/39869977452.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/rorobomisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9793/9367/files/nokaxeponuwisimalapoz.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/51248381063.pdf
    • https://cdn.shopify.com/s/files/1/0432/1594/5890/files/ipad_markup_pencil.pdf
    • https://cdn.shopify.com/s/files/1/0432/1574/9281/files/xuxapitowasitevis.pdf
    • https://cdn.shopify.com/s/files/1/0438/7530/3592/files/pdf_splitter_and_merger_free_software.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botezosural.pdf
    • https://cdn.shopify.com/s/files/1/0431/0895/8362/files/bagibawikawekaraji.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1465/files/fowotofasepixurave.pdf
    • https://cdn.shopify.com/s/files/1/0438/6321/2192/files/cours_atomistique_en_arabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8020/files/28375904841.pdf
    • https://cdn.shopify.com/s/files/1/0429/4275/9071/files/10786281504.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_off0000731b.bin
457871ca62699498af1b8948c6bb0892c0379705d4f525e34220dc1ada0d3c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x731B 5876 bytes
font_01_sfnt_off0000872b.bin
a6a4298befd9c06573984a1a51a34f735c302f1cf250a72324ffbc69ea59e052		 pdf-font-stream PDF embedded font (sfnt) at offset 0x872B 10112 bytes

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