Malicious PDF — malware analysis report

Static analysis result for SHA-256 b621372897844ec8…

MALICIOUS

PDF

43.4 KB Created: 2020-08-14 06:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4cb38893fd74c8cbe929af6a025c3656 SHA-1: 5c1aa3e52a966ef3e2320e77bd884bed0becdf2d SHA-256: b621372897844ec88882798ca3cfac25353b88e262189c5885237dc85762ef6f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to 'science for grade 2 worksheets' and includes the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a link farm further indicates malicious intent to distribute malicious 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.ru/wb?keyword=science%20for%20grade%202%20worksheets In PDF document text
    • http://files.michelsphotos.com/uploads/1/3/0/9/130969819/6647722.pdfIn PDF document text
    • http://files.calhighdance.com/uploads/1/3/1/3/131379999/ravazoxubo-wifokoz-mugamefi-zoxot.pdfIn PDF document text
    • http://files.beaconbeerco.com/uploads/1/3/1/4/131453124/duvepufat-retefupemefu-dezufa-bowipusiliri.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/1/0431/0453/4692/files/76200956919.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4032/6300/files/lepelabagelekenivite.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/62864928701.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/muzimevazoba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3492/7513/files/69830314980.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4363/3822/files/75119920053.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/3878066177.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56666804065.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/night_bot_twitch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/7065/5381/files/skf_bearing_number_identification.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/49245243906.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/dermatitis_atopik_bayi.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 8

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_off00006ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB0 5640 bytes
SHA-256: 2241eedffff7029b1617b6e641f3d879c4b6d8ff06d76bd3e4af351988cf666e
font_01_sfnt_off00007dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEA 10240 bytes
SHA-256: ce03f47c023ece5b4bbef972b1c53f440a1156bedce2b6972e5cbdab9cf1eeb7

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