Malicious PDF — malware analysis report

Static analysis result for SHA-256 160368e385d1fec2…

MALICIOUS

PDF

45.8 KB Created: 2020-10-02 14:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 8ce95a9593e27fe0863dd2d25e4e379f SHA-1: dce64290a033165a177ebc2d9e0791809b113fd6 SHA-256: 160368e385d1fec23e165647ddb38de6c5373adacb804d791dc6525a05e15994
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gettraff.ru/strik?keyword=active+and+passive+voice+in+urdu+and+english+pdf In PDF document text
    • https://site-1037215.mozfiles.com/files/1037215/40445306414.pdfIn PDF document text
    • http://files.99westcustoms.com/uploads/1/3/0/8/130873983/futulevaxufexuxewof.pdfIn PDF document text
    • http://puwez.mrwisner.com/uploads/1/3/1/3/131379844/6583730.pdfIn PDF document text
    • http://files.survivorsofstrokeniagara.com/uploads/1/3/1/4/131438056/0534d.pdfIn PDF document text
    • http://files.annepauley.com/uploads/1/3/1/3/131380600/koxarixikesasi_rikeva_fixage.pdfIn PDF document text
    • http://files.wilfredoramosjr.com/uploads/1/3/1/4/131437623/lujujefijawa-jepatan-vewosonago.pdfIn PDF document text
    • http://files.coastalcitygoods.com/uploads/1/3/1/4/131407197/cd0e5cb6.pdfIn PDF document text
    • http://files.mstgrant.org/uploads/1/3/1/3/131398224/xiruseso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2296/0800/files/tupuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0923/1006/files/12484004984.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7128/3098/files/86151618418.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0094/7103/files/replace_command_minecraft_1.16.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA1 5348 bytes
SHA-256: 736a3e90faeecc24d000bac025776340c657dab0ea19754a77c8788822e980bf
font_01_sfnt_off000061c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C9 10140 bytes
SHA-256: 773866fa483d8d85b1f9efd7ebaabde3a02c448010872bbbde76719b0cdd8b32
font_02_sfnt_off000084b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B5 16660 bytes
SHA-256: cf1231fd93ea3483f98cc1d12ce00fb77addac53e84aec90c0bf909d163bf242
font_03_sfnt_off00009bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333