Malicious PDF — malware analysis report

Static analysis result for SHA-256 7913db7eda16de2f…

MALICIOUS

PDF

40.8 KB Created: 2020-08-23 19:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9a52e3723708fee932348bb89cd7d062 SHA-1: a19fb07afe8251c70a674516f4e46496a6cd4c8d SHA-256: 7913db7eda16de2f9aee8085ad1ab5d9123c3b9d6e2e72057d8916e54b0c337a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that leads to this redirector, which in turn likely serves a malicious payload. The ML classifier strongly indicates maliciousness.

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=csu+honors+thesis+guide In PDF document text
    • http://xolos.csno-sdi.org/uploads/1/3/1/4/131437544/5340323.pdfIn PDF document text
    • http://mukona.bayareaflightinstruction.com/uploads/1/3/0/9/130969690/zakadogamov.pdfIn PDF document text
    • http://files.positivitymagic.com/uploads/1/3/0/7/130738752/vakebuxetul.pdfIn PDF document text
    • http://files.mcalpine30days.com/uploads/1/3/2/8/132814136/fesok-rawuvowasomunir-woxetowuma-dekaxetubonisi.pdfIn PDF document text
    • http://sulake.decatn.org/uploads/1/3/1/3/131383839/6431152.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/1/0428/8416/9894/files/best_free_weight_lifting_apps_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/tiwedanosabavuzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5925/6232/files/autodesk_cfd_simulation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/mawosisebixojavenerusukul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/3390/3513/files/49235832148.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/application_form_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98012128422.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3218030698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8343/9003/files/configuring_sendmail_ubuntu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6690/8054/files/kowibave.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7841/8583/files/6887990373.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_off000061fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FC 4752 bytes
SHA-256: 8870054917ba0ba09da09c1a98225f4c176c4c95237f702c9fa16ea7959f5bc2
font_01_sfnt_off0000721a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x721A 10912 bytes
SHA-256: 7d1d140a088932c1c4ca42850678b1a779c047bd5126f4119470163601a2c83b

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