Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a91585405d8141…

MALICIOUS

PDF

46.3 KB Created: 2020-08-26 11:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 822d481dbc3ec6e273c5e828fc526926 SHA-1: fb7cb06a446aa305dcb6553821c495fadb89651d SHA-256: b9a91585405d8141fedeae7aaa6276b39d13e8932aa60a489d738cd020279b2f
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious link, 'https://ttraff.cc/pify?keyword=zulrah+guide+osrs', is designed to lure users by appearing to be a guide for the game Old School RuneScape. The document body, though heavily obfuscated, contains this URL, confirming its intent to redirect users to potentially harmful content.

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.cc/pify?keyword=zulrah+guide+osrs In PDF document text
    • http://files.lclfarm.com/uploads/1/3/2/6/132683328/goxosi.pdfIn PDF document text
    • http://files.mjshilltopfarm.ca/uploads/1/3/0/9/130969576/3984718.pdfIn PDF document text
    • http://files.stbrendansreds.com/uploads/1/3/2/3/132303024/turidibutira_kesanekafasow.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/1/0435/5905/9615/files/19720224194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/9224/2588/files/iob_atal_pension_yojana_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7295/4269/files/91464936938.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4866/3200/files/43654649673.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/76242372059.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5638/8510/files/22975261058.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/7093/9285/files/87574768377.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/dimijarazenoxedupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7565/6097/files/bienestar_y_calidad_de_vida_laboral.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5240/7704/files/accordare_batteria.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_off000078bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78BF 5044 bytes
SHA-256: 411005159c99b31fdff8f3d1b3a93f14def31e8aa205be90cd47c6a239bfc3fa
font_01_sfnt_off000089d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D6 10096 bytes
SHA-256: 9dd82eb74caf19b03fcf5a5e1f35a43ab2305ae641aaab55e339e75ec318061c

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