Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb055842408f6430…

MALICIOUS

PDF

44.3 KB Created: 2020-10-04 03:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 180faf94e34fd9a83456ab00d7e0ec43 SHA-1: da934a0b93ac0c4a6af1f1b31fdefb42c5ec9ad4 SHA-256: cb055842408f6430d50ff84b8c2b3efc514c1fb2f8fa82cca31c61fd74f85f6d
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://ggtraff.ru/strik?keyword=listening+test+1+dreamtime+travel+agency+answers In PDF document text
    • https://site-1037865.mozfiles.com/files/1037865/9632145586.pdfIn PDF document text
    • http://files.roundthesound.com/uploads/1/3/1/6/131637853/jofamegogi_jewunafot_sexefetepu.pdfIn PDF document text
    • http://duwavi.jongliddonauthor.com/uploads/1/3/2/8/132814938/aeb74976e5c7.pdfIn PDF document text
    • http://semapa.crazyartmama.com/uploads/1/3/1/6/131637136/fd0b773345b6209.pdfIn PDF document text
    • http://practicepteonline.com/wp-content/uploads/2020/06/161_In 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/1/0481/8301/7621/files/todefedonugenidodutifej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4183/2615/files/run_dont_walk_meme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0822/7490/files/gabutozaroxobimutiwuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0060/5089/files/nj_marathon_2020_coronavirus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3963/2803/files/best_skyrim_mods_xbox_one_2019_load_order.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7133/6355/files/football_manager_handheld_2015_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8037/5715/files/lodujakijixixusix.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFA 5184 bytes
SHA-256: ebf674b0ce6586676e78cf39816ba3da57ec8efb0da83e92dba55f285a7f6919
font_01_sfnt_off00007194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7194 10644 bytes
SHA-256: 6d908743a6ee6cc7212acedc25e316a284f158bbe3951433df80e0a476c7664c
font_02_sfnt_off000095d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95D2 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230