Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac31ba05b4fdbec9…

MALICIOUS

PDF

43.8 KB Created: 2020-08-12 15:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8de031458d86a47e53e8a72d0922b84b SHA-1: ac02710485811f2d26fd8cedd8a20e45d6cc56e3 SHA-256: ac31ba05b4fdbec9d23bb57cce0e2149054f22a626bfcf1bf488caeaf2fa6fc3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/wb?keyword=download%20dicionario%20ingles%20portugues%20pdf%20oxford`. This indicates the document is designed to redirect users to malicious infrastructure. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which are hosted on Shopify. The primary malicious URL is the most significant IOC, likely serving as a gateway to further malicious content or exploits.

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://ttraff.ru/wb?keyword=download%20dicionario%20ingles%20portugues%20pdf%20oxford In PDF document text
    • http://nofumobe.bluemountainrhythms.com/uploads/1/3/0/8/130814174/resatowugerun_maroxiborakafi_juwamewolok.pdfIn PDF document text
    • http://files.papasnowmusic.com/uploads/1/3/0/7/130739053/ganaloferenutu_lorezosuv_budelotib_kufogatapukizig.pdfIn PDF document text
    • http://files.mykajelinastudio.com/uploads/1/3/1/4/131408798/5139890.pdfIn PDF document text
    • http://ganudebe.hootandhollerpr.com/uploads/1/3/0/7/130776445/9057657.pdfIn PDF document text
    • http://files.apprazrapp.com/uploads/1/3/1/4/131406430/feac20ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1256/2849/files/18090855183.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4220/9945/files/zirefaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/45947186414.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/manual_de_execuo_araken_de_assis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1610/1781/files/70055180779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1855/0439/files/caprari_pumps.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/7186/8821/files/autoclave_in_microbiology_lab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0487/9271/files/41706156432.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/demalujafudixokevude.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E93 5480 bytes
SHA-256: 8fa1b012f54a5b194f26f32724efe25b3d8f8e8414eb35e5a1133279e4dd20c5
font_01_sfnt_off00007165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7165 16356 bytes
SHA-256: 484f231404243d03821cf6c8dbb8251b21fc3c76f488d95ba3ee00156fe7b39e

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