Malicious PDF — malware analysis report

Static analysis result for SHA-256 687739f1427d8c4e…

MALICIOUS

PDF

42.7 KB Created: 2020-08-09 21:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9813786d437ec786d4b9fb0ea12b63d SHA-1: 2a504827b91294aa914364ee5ace82b918c73a17 SHA-256: 687739f1427d8c4e2c391b99eae385979545df664909dad9ec6073281c64fd5a
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting a phishing or scam attempt to trick users into downloading potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=biochemistry+textbook+for+medical+students+pdf
    • http://files.phoenixhypnobirthing.com/uploads/1/3/1/4/131408942/majirakubit_fariwiwemajaren_rumanurimonizeg.pdf
    • http://files.kapnordicskiers.com/uploads/1/3/2/6/132681452/de8eff15f53ab89.pdf
    • http://files.perfecthealth-namibia.com/uploads/1/3/0/7/130739404/fogizirugedataf.pdf
    • http://files.hayman.co.nz/uploads/1/3/0/8/130873826/bolavuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6828/3294/files/kijuposenulobajolop.pdf
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/vorefimikorutujezemu.pdf
    • https://cdn.shopify.com/s/files/1/0450/6284/8664/files/applied_psychology_in_human_resource_management_7th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5841/files/winipuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/3910/3912/files/ruwage.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/tovezawa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/zudoxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5978/files/zineradifenulozotitumop.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9148/files/amoxicilina_bd_400_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/5349/0071/files/jojituluvagizajovud.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/takafusazejowiz.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_off00005ff3.bin
bcd5ef9cbeac3dabc0bd29ed225a0541e616034f96c085b20e2314a0f6516f00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF3 5820 bytes
font_01_sfnt_off000073a4.bin
cac731634951b8f1e8abf0db08c5a96396e2a1a9dc8bf38e2f71fed0d6922d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A4 13080 bytes

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