Malicious PDF — malware analysis report

Static analysis result for SHA-256 745d97c7f08b6df9…

MALICIOUS

PDF

38.7 KB Created: 2020-08-12 21:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe07137c7f5d1e761d9484e1d6ffe227 SHA-1: e0755a5d985f804424cd68264fa3ac1734f2b488 SHA-256: 745d97c7f08b6df94799cd0a1d2d2021249cf3504720fa5657c65702ebf5b680
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are designed to appear as legitimate academic resources. The primary link identified, 'https://ttraff.ru/pify?keyword=cambridge+academic+english+b1+intermediate+student+book+pdf', is known to redirect to malicious infrastructure. This suggests a phishing or scam attempt, leveraging a link farm to distribute malicious content.

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://ttraff.ru/pify?keyword=cambridge+academic+english+b1+intermediate+student+book+pdf
    • http://files.vidatacos.com/uploads/1/3/2/6/132682076/nusilabitomipe_refazo_gamasowupoluke.pdf
    • http://zepesi.aseatatthetable.org/uploads/1/3/0/7/130776208/zovazi.pdf
    • http://files.simpleeating.net/uploads/1/3/1/4/131407424/mapemub-bavorunerejer-zoxewewas.pdf
    • http://files.npdwc.org/uploads/1/3/1/8/131856232/kadawox_rifumijuvev_zokakilulalen_wowatepa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5941/1094/files/pevarezevi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2982/1602/files/peningkatan_kualitas_sumber_daya_manusia.pdf
    • https://cdn.shopify.com/s/files/1/0435/1623/1840/files/59930609205.pdf
    • https://cdn.shopify.com/s/files/1/0437/2732/3301/files/86218580023.pdf
    • https://cdn.shopify.com/s/files/1/0447/2560/0410/files/sample_business_valuation_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/3107/5743/files/96479229473.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/moxulatodo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/exam_essentials_practice_tests_cambridge_english_first_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/jugikopedenadoxurademet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4406/0839/files/wamebobozufupofikerorug.pdf
    • https://cdn.shopify.com/s/files/1/0429/0982/7231/files/kamatuwupolupovobivetal.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9287/files/redawokejavugogaja.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005495.bin
248b90d343a23140bc7d1f47724c1fc0c16d042cc2b25bb28e7e1574dadacbc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5495 5728 bytes
font_01_sfnt_off000067e8.bin
fecdce270a7a62a70e57965ae09a024931dad8416abb76e99020a9d7870ad5af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E8 10312 bytes

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