Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8d8a73c87afcf1…

MALICIOUS

PDF

52.9 KB Created: 2020-10-28 05:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e801e8255ec516c7b581a5a21910ddc2 SHA-1: 307d2d66bf16848a60166d10af2ee84a139c2e8a SHA-256: 7d8d8a73c87afcf16479fa32830b1b341b7ca232a16206ff5294f80310bb61e7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this malicious URL. The presence of numerous external links, many pointing to PDF files, suggests a link farm or redirection scheme designed to lead users to malicious content. No scripts were extracted, but the primary threat appears to be URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/strik?keyword=spherical+harmonics+matlab In PDF document text
    • https://vorenamu.weebly.com/uploads/1/3/4/2/134265490/34a5905510f277.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/69468e.pdfIn PDF document text
    • https://wusinetowaje.weebly.com/uploads/1/3/4/4/134471696/aec4530787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5f889ccde5acb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f98be7c06e23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5f8cbfbcc1db3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f8a1fb084c57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/570b871c-af40-42c2-ba52-c6950eae9dfe/20863317473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba26209-faa4-49e9-af7a-66dc3132f5e5/wedixorizake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3aacf8-8be7-4f39-aff2-9ec1f9428495/middlebury_college_football_coaches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e078418b-10a9-490f-bea8-88f287874891/wirizebuxexadogomemegubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5749a204-0fe9-42d4-b8e0-92b85621d026/97974373306.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3874/8071/files/kmart_semi_automatic_coffee_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/gabuxap.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/marguerite_yourcenar_memoirs_of_hadrian.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/ropejedeminonol.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/pebiwuzatijorujokajifix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7303/9255/files/83514865317.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2153/5896/files/35304996082.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5671/7206/files/essential_biochemistry_3rd_edition_wiley.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF2 5204 bytes
SHA-256: 847510686ee18a4328f9d9fae585b435568b18f6b097bde64e9f7d2a2f3f43b3
font_01_sfnt_off00007f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F57 6068 bytes
SHA-256: d8e4b7f44dfb66ea49c7f1cefd345a391fade3fb548cc17de4cdbf151663dabd
font_02_sfnt_off00008f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F08 12084 bytes
SHA-256: 1ee2a21fa47f4aff779e3f01c102b564786dc8ea748620bc260eeb1611d1a422
font_03_sfnt_off0000b7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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