Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebd2c1c5f87edb7…

MALICIOUS

PDF

51.4 KB Created: 2020-08-08 23:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e67693a7255ef59f97731c89aa15e61 SHA-1: 38d5036f2c1d8fe244b3393e0f481ddede4dcd9e SHA-256: 5ebd2c1c5f87edb7c2d8fe1039890f93eba92ab07b547715f39fce0302ab4403
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised with a seemingly benign search query. The document body, though heavily obfuscated, also contains the malicious URL. The presence of numerous other links, many pointing to benign Shopify domains, suggests a link farm used for SEO poisoning to attract victims.

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.ru/pify?keyword=learning+chinese+characters+pdf+free+download
    • http://files.simonemaurerflute.com/uploads/1/3/1/4/131438538/9944646.pdf
    • http://files.modga.net/uploads/1/3/2/6/132695361/dexemorogamebuw.pdf
    • http://files.bringmorehappy.com/uploads/1/3/0/8/130874403/6077982.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0446/7975/7977/files/butterball_electric_turkey_fryer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/71969025066.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/makkar_ielts_speaking_2020_jan_to_april.pdf
    • https://cdn.shopify.com/s/files/1/0440/8688/6552/files/waxesemitarorotalevupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8912/files/60740971184.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4204/files/minecraft_eye_of_ender_recipe.pdf
    • https://cdn.shopify.com/s/files/1/0437/8365/1490/files/xemaxumabomewaluxubimobox.pdf
    • https://cdn.shopify.com/s/files/1/0436/1568/2717/files/sremmlife_2_download_zip.pdf
    • https://cdn.shopify.com/s/files/1/0431/6400/8605/files/32123792142.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/72663033043.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/89746960104.pdf
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/babimutodewebarimapidum.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0317/files/92163443730.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.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_off00007f7c.bin
4816704e937d9737dca91a9d17bd7e657e44b6224c4460270cce1ce5b6849520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7C 3192 bytes
font_01_sfnt_off00008aea.bin
4c1af73189e2f221acd0cc285b6153ca89773d646c5fb31cfc8f2c46b3a1a83d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEA 5448 bytes
font_02_sfnt_off00009d89.bin
769879750378bd7e75b1fa6e61bd9d7b21afc35be1feeeb8555fac0bee6f977b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D89 10044 bytes

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