Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd13c3f8ee166c9c…

MALICIOUS

PDF

72.9 KB Created: 2020-11-04 03:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 19793cd8c17193def72f033ac45a59f4 SHA-1: d08966a5ea990534791948c48fb1a3b5710d8022 SHA-256: fd13c3f8ee166c9c99e6fb2d5eea6cb97fffce3d5cdea3feb364458449ba0006
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/strik?keyword=what+is+a+satellite+nation In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f8ab233322ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385635/normal_5fa1fa91ba15c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f88bc48dd41b.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/8537505.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/8494388.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/4e1a4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/31b774c4-97e5-4f7b-87c2-35a9fdebd133/roledirowopedux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758914d7-ad83-4e48-a807-1481cdac1c89/tufoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bfc4c2b-24ab-4aa3-8a40-b969abe63991/98094763020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d90ca35-c0a2-4c5d-8c05-70909979bd0c/xirovudakawopizobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be927b35-9afc-4d11-9efe-91845ca7da52/39218250690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1655677f-eeee-43a7-998f-2f795c403208/xujunonugo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC7 34804 bytes
SHA-256: ac071712f2a65063b946867a986641466f15588f1d8e6ecca438f987dd895c7a
font_01_sfnt_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 4480 bytes
SHA-256: 242a3c59519e1c822b9e901085ec7e2fead0e98904e9a60c5ada3c5a968028c1
font_02_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 10464 bytes
SHA-256: ab656e0946cedb74e1f94392a68202a5a37b613153a1b36d6949fbf25b14290b
font_03_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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