Malicious PDF — malware analysis report

Static analysis result for SHA-256 4312a461aae51b7f…

MALICIOUS

PDF

42.5 KB Created: 2020-10-28 22:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2a3685cfbf1f116eb9048a5bc699af7c SHA-1: 32666440e3c93df40774a7b5bc2288d67c35d318 SHA-256: 4312a461aae51b7f1ab39339cd4016064c7d85f14d1f374d76af7f2d9bddf2e4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure. The presence of many links suggests an attempt to create a link farm or to obscure the malicious destination among many benign-looking ones.

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://cctraff.ru/aws?keyword=thule+double+stroller In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_5f8d4048289b9.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/063c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f8c854306396.pdfIn PDF document text
    • https://gifedoku.weebly.com/uploads/1/3/4/2/134234788/bigajozemexolane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f875a394765e.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/papimi-nefewekapojerof-vorur.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/1/0482/8400/8603/files/large_cast_iron_griddle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4207/4535/files/wynk_music_apk_download_for_pc_windows_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3070/7865/files/vulaxabuniwiwivifiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d57223-8d13-4b2f-9c04-ab4bf0d0418b/unison_audio_midi_chord_pack_free_do.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/zirovimowizo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7323/2291/files/cell_energy_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8891/3592/files/7429048228.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8834/9846/files/direct_vs_indirect_object_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6fbc95d-c990-474f-8585-1a7883ceebf9/pipewovomalomiporesokojob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0449/2438/files/aurelion_sol_guide_top.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/1151/2986/files/74318434486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a309acae-0721-4bb0-aa36-8d8efbaeda1d/begijalogufavasan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/53084832047.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8947/0643/files/vepavovas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6381/0975/files/bith_star_wars_saga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7300/9327/files/peugeot_3008_repair_manual_download.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_off0000696b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x696B 4792 bytes
SHA-256: 7eec9dc51a752d304b655c7ecfe6b15a0c9947ef3c3ce8b17f968827183801ba
font_01_sfnt_off000079a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A7 10408 bytes
SHA-256: ef8ff50b0f87961ff969e73fb1da563e1453df6f0a19b0e092a1dd0ee4264d0b

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