Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7c90879a1cbf30…

MALICIOUS

PDF

42.4 KB Created: 2020-08-15 05:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 56c4c40166d1ce68ab0e44e05b1dd30f SHA-1: abb98ae5702f02474c8519283b87cacb850705f9 SHA-256: 9d7c90879a1cbf309aee121139c41cd9fd9eb16f8960be8542647e1b2286d5a7
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed to drive traffic to a malicious redirector. The document body, though heavily obfuscated, contains text related to 'usmle step 1 first aid 2019 pdf free download' and a URL that matches the redirector link found in the heuristics. This suggests a phishing or scam attempt to lure users to malicious infrastructure.

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.com/wb?keyword=usmle%20step%201%20first%20aid%202019%20pdf%20free%20download In PDF document text
    • http://files.mindwarehouseconnect.com/uploads/1/3/1/3/131383791/dabebafujavarobi.pdfIn PDF document text
    • http://files.lasvegascharactervisits.com/uploads/1/3/1/6/131607075/levaxikolixana-reveguvezeleweb-wujiso.pdfIn PDF document text
    • http://lududokar.vaalrivercitymarathon.com/uploads/1/3/0/9/130968973/nujufubonatilo.pdfIn PDF document text
    • http://files.storyshack.org/uploads/1/3/2/6/132682790/sofepasatumokozikiju.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/1/0432/6536/0034/files/bavaru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1438/8888/files/lateral_epicondylitis_patient.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4211/0631/files/albion_online_beginners_guide_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8117/9037/files/leberefubamokuvirowejiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9961/1553/files/series_6_exam_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78214852322.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2362/8450/files/castells_communication_power.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0649/8728/files/85728413570.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/53023691475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/14705153709.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D41 5752 bytes
SHA-256: c6ec846be07358ee37ce1e9cb0f964e15d139d1e4e5845fa23174c3f25828407
font_01_sfnt_off000070ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70CE 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000795c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x795C 10224 bytes
SHA-256: 09d63260f2ccc7334b2879c9f8c514c07ce8fc65008dc2900554ce27fbcec869

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