Malicious PDF — malware analysis report

Static analysis result for SHA-256 666777df2aed5837…

MALICIOUS

PDF

42.6 KB Created: 2020-08-06 12:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60d10344dc03a84d5345a01ef535ac67 SHA-1: 67a9a874e0467602b00bcf767a68b2a939d3f4d5 SHA-256: 666777df2aed5837b079737c886ce7677b3f3afaf443dcde3a1d33045b255b77
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent link, disguised as a resource for 'balancing chemical reactions', redirects to a malicious URL (https://ttraff.com/pify). This indicates a phishing or malicious redirection attempt, likely to deliver a secondary payload or lead the user to a fraudulent site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=balancing+chemical+reactions+pdf
    • http://files.yeeplace.org/uploads/1/3/0/8/130813427/2605567.pdf
    • http://files.consciousbirthmanila.com/uploads/1/3/2/8/132815183/nonevijibufax_pasojed_tuwomuxe.pdf
    • http://files.opentothedivine.com/uploads/1/3/1/4/131454238/1382281.pdf
    • http://files.jabramowitz.com/uploads/1/3/1/4/131483083/kunes-maneliwafezuvib-dobajelepubaja-xoxuvaworirum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3281/3473/files/csv_to_vcard.pdf
    • https://cdn.shopify.com/s/files/1/0436/0699/9203/files/doppler_de_arteria_cerebral_media.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8279/files/dajedaxolevebisupape.pdf
    • https://cdn.shopify.com/s/files/1/0433/7804/9189/files/xejixujepi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7384/6952/files/dialysis_disequilibrium_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/kekilinujiveturezifiwexuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8246/files/tikibinimelejixalupoji.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/18721114592.pdf
    • https://cdn.shopify.com/s/files/1/0437/3771/0744/files/57501560233.pdf
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/pejamufejanubusawam.pdf
    • https://cdn.shopify.com/s/files/1/0431/6368/0929/files/28740622836.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/mopox.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_off00006777.bin
6f32b11fc656078d2c80774710ca05e08d5c7530931e3fed95766d9894095cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6777 5616 bytes
font_01_sfnt_off00007a64.bin
92fb638635fec9c2fc6b22e4555a127eaa0d25b001c51fdff00ee566b8549fe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A64 10320 bytes

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