Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e7dce9945a5c4f…

MALICIOUS

PDF

33.4 KB Created: 2020-08-02 23:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cda9ebaa972bf287ce32b96154e3524e SHA-1: 3b07f420a22b21fb974d4c34180d5898f9accdd5 SHA-256: 66e7dce9945a5c4f9f5427b69799194d8766a93b190116349215c3211a90888f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=dewalt+dw733+manual'. The document body, though heavily obfuscated, contains text related to a Dewalt manual and the wkhtmltopdf tool, suggesting a lure. The presence of a large number of external links, many hosted on Shopify, indicates a link farm designed to distribute traffic, likely for SEO manipulation or to host further malicious 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=dewalt+dw733+manual
    • http://files.thorneaircon.com/uploads/1/3/1/0/131069819/9136562.pdf
    • http://files.bringthefun.com/uploads/1/3/0/7/130739315/jasedukaxat_pilixubud.pdf
    • http://files.gillmanningscox.co.uk/uploads/1/3/0/7/130738970/bosovebixidimu_mepew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/php_download_file_from_url.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/dogadasomazaterugebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1702/files/giloxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4040/7701/files/japisivefidoviwomikifusij.pdf
    • https://cdn.shopify.com/s/files/1/0434/6796/4580/files/miwuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/45091142510.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/42993669483.pdf
    • https://cdn.shopify.com/s/files/1/0435/1783/7467/files/969573846.pdf
    • https://cdn.shopify.com/s/files/1/0429/0438/7750/files/goxofexovifu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/88085301419.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1329/files/brother_hl-_2280dw_wireless_setup.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/66435889406.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/maderowutetesufolako.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1135/files/85242324520.pdf
    • https://cdn.shopify.com/s/files/1/0429/1015/4908/files/7622074955.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_off000048bb.bin
1e95f70ec0c4ad32e7f0878e7f9662ab068be1bb22d4158cc8b2bd8d0ae7fc39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48BB 5032 bytes
font_01_sfnt_off000059ea.bin
f956af4bdd1d88bab00053d22d54291dcb6a625a5dc44d4375cea3ab08e4464e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59EA 9004 bytes

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