Malicious PDF — malware analysis report

Static analysis result for SHA-256 07cc2bd90f8190d1…

MALICIOUS

PDF

38.3 KB Created: 2020-09-29 20:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 814f97eb98d764d499f8284eb2ba65c9 SHA-1: e3d34a6a461bc6cdf90371b2125cf0b0cb0683a7 SHA-256: 07cc2bd90f8190d16df58ea141042444338f690a245b3a8cc7738a79ccfc85b8
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, and one specifically to a known malicious redirector. The document body itself contains obfuscated text and URLs, suggesting an attempt to lure users into clicking through to malicious content. The ML classifier strongly indicated maliciousness, and the link farm behavior is a common tactic for distributing malware or phishing lures.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=rediscovering+the+social+group+a+self-+categorization+theory+pdf In PDF document text
    • http://files.wisdomcambodia.org/uploads/1/3/1/1/131164110/samitubuxefegatajato.pdfIn PDF document text
    • http://fulagiv.doulasofomaha.com/uploads/1/3/0/8/130814328/vitolapatipamesadimu.pdfIn PDF document text
    • http://suwof.aspiecomic.com/uploads/1/3/1/6/131637308/nugowivozoxutizazeto.pdfIn PDF document text
    • http://files.annaravenscroft.com/uploads/1/3/1/6/131606563/zofefupisomelo.pdfIn PDF document text
    • http://files.crossroads-assembly.org/uploads/1/3/0/7/130739535/236560.pdfIn PDF document text
    • http://sitoze.pinkzebracheer.com/uploads/1/3/1/6/131637254/tonop.pdfIn PDF document text
    • http://files.losangelesaazk.org/uploads/1/3/0/7/130776164/kigofuxuxotes_puzopexalojedu.pdfIn PDF document text
    • http://tegetel.thephotocopiedhipster.com/uploads/1/3/2/7/132712615/20b33fe3eb.pdfIn PDF document text
    • http://lipat.getagripmarine.com/uploads/1/3/2/3/132303168/gezorijunusejuze.pdfIn PDF document text
    • http://tiguvo.notsuchsecretlife.com/uploads/1/3/1/4/131437079/4e6e077accf.pdfIn PDF document text
    • http://direbaka.ysk-chb.com/uploads/1/3/1/4/131406676/tamazemowesojimidal.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/1/0432/4923/8184/files/general_chemistry_1_pbsc_labotory_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2809/3856/files/gezutusabujop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/rabeliwotijimujulazofux.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_off00005616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5616 5668 bytes
SHA-256: 1efe935cb5ade5dba7c406082413b00057d09b28d7e252ca492d63c6da2f2552
font_01_sfnt_off0000698a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x698A 10084 bytes
SHA-256: c757133651551f8421bd734a7549ee5f19e0b9fc44f1096529e1773a2cd545ce

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