Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e16dd1fb7623a2…

MALICIOUS

PDF

49.8 KB Created: 2020-10-31 09:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 326a0c9a51385f74a59f5bbecd11be2d SHA-1: 2dce55986c6900ea886b4bf0e218ca452c963032 SHA-256: e4e16dd1fb7623a22c9134eb330b2d3fb58b2b10b299b5feff31fce15f761b6f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/123?keyword=marine+corps+yumi+raw In PDF document text
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/gotilegox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_5f97928ac6cf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5f88bb086327f.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://s3.amazonaws.com/kikunojulejuj/cross_cultural_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/vufigorijatula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4602/6407/files/74176604298.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/past_tense_present_tense_future_tense_words.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/rozadikafamag.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/lucas_tune_up_in_a_bottle_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/pifalikinivowotano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6153/5132/files/sauder_harbor_view_corner_computer_desk_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8039/3915/files/zumop.pdfIn PDF document text
    • https://s3.amazonaws.com/tagorarib/zapajop.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/fedawefeke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3349/3148/files/how_to_delete_walmart_money_card_account.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000659a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x659A 4980 bytes
SHA-256: e2bfc839c27cab693620e996248f49dbd282bbd001b6519e9240e09d51796dcf
font_01_sfnt_off0000770b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x770B 5048 bytes
SHA-256: 4c590ae49b22b90049f05b4f90829b409013822f7e22cfe017356c34c911fa70
font_02_sfnt_off00008822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8822 10380 bytes
SHA-256: f9306cc486db167fd7adf0cef7e657b76fe06bc4be8877dc002eb850fb421d72
font_03_sfnt_off0000abc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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