Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b2b1f717f36e2c…

MALICIOUS

PDF

43.5 KB Created: 2020-08-10 20:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 901a91298636b5865c3335171f52b833 SHA-1: ab7abc21d7806626a408edb2be73601c53c00a40 SHA-256: 05b2b1f717f36e2ccc63490dd0628df8341e2caa32cb0b9604606131c468de10
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains the same URL, suggesting an attempt to trick users into downloading content from a malicious source. The presence of a large number of external links also points to a link farm strategy.

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=domain+driven+design+eric+evans+pdf+portugues+download
    • http://files.lknailsandbeauty.co.uk/uploads/1/3/2/6/132681938/wovaxale.pdf
    • http://files.objectsofdesireuk.com/uploads/1/3/1/8/131871614/jovewozisiduw_pofejewuruvipub_bexekaz.pdf
    • http://files.buffalobabybums.com/uploads/1/3/1/8/131871518/pepudolafajiduf.pdf
    • http://files.geordie-genes.co.uk/uploads/1/3/1/6/131637365/d6ad24626fc0.pdf
    • http://files.adurdendm.com/uploads/1/3/2/6/132696104/ragamimosizetolojum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9387/6118/files/surunotiwetapokarozu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7552/files/dinamani_news_paper_today_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0437/2601/2567/files/1994_chevy_silverado_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/ropimunife.pdf
    • https://cdn.shopify.com/s/files/1/0428/8918/3398/files/52534073631.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9341/files/angielski_sownik_tematyczny.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/38516690067.pdf
    • https://cdn.shopify.com/s/files/1/0434/5187/5481/files/english_cebuano_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0430/3683/5993/files/ccent_practice_exam.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1783/files/badminton_court_size_in_cm.pdf
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/best_reader_windows_xp.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugogesobiwem.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_off00006869.bin
bd40bd3d47c3406ae625344a35178a9e546326b1d26445a66a46ae5b1453056d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6869 5628 bytes
font_01_sfnt_off00007b84.bin
715020f4304c94d73e7e3a7d32c48177e066a1f05e0b3aaa7ad69a0c02c47df9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B84 11164 bytes

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