Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8d708fb7eb910e…

MALICIOUS

PDF

42.7 KB Created: 2020-07-18 04:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 92e74a2b4f484a24e25e6d701e826522 SHA-1: 71524a60042c429c512aed5c388e2805ef9c8a58 SHA-256: 8d8d708fb7eb910e34b353c38d5505647ebb82b89c73259b0176ada2cf5e5a3d
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wb?keyword=toi%20epaper%20pdf%20free%20download'. Another critical heuristic identifies this as a PDF SEO link farm, with 30 generated links. The document body contains garbled text and metadata suggesting it was generated by wkhtmltopdf, likely as part of an SEO spam or phishing campaign.

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=toi%20epaper%20pdf%20free%20download In PDF document text
    • http://files.lightsourcechiropractic.com/uploads/1/3/0/8/130813898/8397318.pdfIn PDF document text
    • http://files.bigapplecaroffice.com/uploads/1/3/2/8/132814048/subetodetapol-pofepejepame.pdfIn PDF document text
    • http://files.militarylawpro.com/uploads/1/3/1/3/131381602/vabutidovizino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ruguduvig.files.wordpress.com/2020/07/zuzekokinitibifenezadawor.pdfIn PDF document text
    • https://visinoxi.files.wordpress.com/2020/07/daxonodemamateginix.pdfIn PDF document text
    • https://gilogekef.files.wordpress.com/2020/07/40652735234.pdfIn PDF document text
    • https://pasaxowudale.files.wordpress.com/2020/07/fewonogegegej.pdfIn PDF document text
    • https://dajakogeme.files.wordpress.com/2020/07/42772125982.pdfIn PDF document text
    • https://zotevewu.files.wordpress.com/2020/07/ropigijujudetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/31095787462.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/wanipafizetimivijos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96704933611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3279/6574/files/muzupivovabekudobimes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/91543325389.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/65953590050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99237037604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fezusagofetivori.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 6

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_off00006af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF6 4608 bytes
SHA-256: acae5a5bcd9146b15136eb22ed771a62d6900f891405e3db349eb9e2bbdb6f88
font_01_sfnt_off00007aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAD 10316 bytes
SHA-256: 52688b31cbf32ad1d798a4cfd48af8c3f20885e8eaa4172312dbfba7c4b7098a

Open this report in the interactive analyzer, or submit your own file for analysis.