Malicious PDF — malware analysis report

Static analysis result for SHA-256 907e08ab8e8a994d…

MALICIOUS

PDF

43.0 KB Created: 2020-11-01 21:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 1c665f5899a82a44ef0c60c1a87554ad SHA-1: 0a4480350acfd12737fe4518522b54eb50cd2768 SHA-256: 907e08ab8e8a994de88b119ee19d5ab68ae5a074e126716ff5b004b4db57cbe8
194 Risk Score

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/123?keyword=istg+meaning+urban In PDF document text
    • https://rofetavagamufup.weebly.com/uploads/1/3/4/3/134373504/gubufilu_malarabu_zatef.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/wogiselaruto-nokage.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd36d1c-aca9-467e-84e3-7e5e8f8c41c2/student_friendly_quantum_field_theory_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da7ee6e-595d-4d23-803c-aaa78472b51a/jiraliwulepubovoguvexabek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85686d4-e724-4398-8185-2e574a767013/xawirokidapujojalidano.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/5591570532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564af703-10c6-45e1-b0be-2dc24bee442d/44583997171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e7f3ed-42b5-47a9-b2c0-68fd6d8cfe4f/45808561741.pdfIn PDF document text
    • https://s3.amazonaws.com/gebaxovudofe/skyrim_amulet_of_arkay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ac07ba-2122-4973-b854-c592dd1af15d/49238749220.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/22925781332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff15c914-62e1-4de1-874f-adb43691c0d4/42038758075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6cae095-b736-44d5-b8f7-ca37404d2c2e/mera_jhumka_utha_ke_laya_song_downlo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05bcf8e1-cf51-4779-b19d-9f34aa65addb/wokomixekijokaliwavi.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/thread_strength_calculation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b27889-cedd-4197-8172-93a584af5476/89227460170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af9a07c-d4f3-4722-a7c6-331fe2aebbe6/fidubizativu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E0 5052 bytes
SHA-256: fb93323548088958412f4e13b1262b6bd66ad171deb5e53d3788730d60c05af4
font_01_sfnt_off000078f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78F5 11228 bytes
SHA-256: 402631a2a0f289620b0221b886a311ad05f2c95fa0fc3643455c83062fca3fc2

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