Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cd40dfc8948bd4…

MALICIOUS

PDF

37.1 KB Created: 2020-10-30 21:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 095f0780abd4a05389b1ee76c1d36ab5 SHA-1: 37ff25f025547f129d03c84885c84d95dc22b98c SHA-256: e8cd40dfc8948bd4f7870e9a9c74b730115485d14db8f2c0f18ee077aaf5dd9e
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to educational material. The presence of multiple links to disposable hosting and a known redirector indicates an attempt to lead the user to malicious content, likely for phishing or malware distribution.

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 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://ttraff.com/123?keyword=compound+words+worksheet+grade+1 In PDF document text
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/jugemizuranuko-xuvusoxa-nepasuwenadirov-pidesedokibus.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/9974569.pdfIn PDF document text
    • https://mewuvirinikupu.weebly.com/uploads/1/3/4/5/134505229/420c313090610aa.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/7696989.pdfIn PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/3518902.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://cdn.shopify.com/s/files/1/0496/5272/7972/files/suntrust_deposit_slip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5cbaabe-3d73-4bc8-a027-f64f3968f203/92847956350.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/half_life_problem_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9368/6945/files/grants_high_school_central_office.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4812/2546/files/rifopegefisokorivomodorib.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/fotatazubijosovesijajosiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a55701f-cc58-4bb7-949b-ff0c6cd07930/ditakaraxagido.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43C2 5404 bytes
SHA-256: 312a63b89d0909535b30565805affecfb7124b3703671a9825fb0cbaf76d25c6
font_01_sfnt_off00005606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5606 10528 bytes
SHA-256: 3de1995168e3c58924d7e2ac21eda8d19e8f9d62d36de1d74074a552347af83a
font_02_sfnt_off000079e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79E9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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