Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05134645eafbebe…

MALICIOUS

PDF

91.8 KB Created: 2020-11-01 00:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 27c799c49af3bc7910fdd3bd7c1fb4b9 SHA-1: 27824d908dc60f1175a104ce3c402f2b25890957 SHA-256: a05134645eafbebe8d4ac39a2e2a00de0f21d7de46f6bb968863f18ed6d68213
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 0.9999

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.link/pify?keyword=matrices+word+problems+worksheet+with+answers In PDF document text
    • https://jaxebenub.weebly.com/uploads/1/3/4/2/134266064/9434903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f8734197aa19.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/wivuduredo-netijagexi-tifizitogek.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/kavalukato/arashiyama_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7319/9000/files/wethersfield_public_schools_2021_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7027/3174/files/sorting_3d_shapes_worksheet_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f793b4-f0a1-46be-b80f-b5b91214d538/welapujativupitojafuso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3228/9178/files/jazavuwevupomidono.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/9918/5312/files/animeheaven_apk_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/angina_treatment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6127/9896/files/mabawibupadesarifudoto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/1954/7036/files/kaxijuwububejixomuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00934a1d-563d-4d90-bcd0-3fc395e105d5/kuzapuxuvalifetaruz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 5404 bytes
SHA-256: 7b270247d71a81595a0a78347ab42e1fb61e655ed1c820f0ba20883054a6e35d
font_01_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11203 13108 bytes
SHA-256: a5f1166e8880fcb2e2e1fb3e544b4ce457191aaac93a56ed93d9ab2f142cc54d
font_03_sfnt_off00013d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1E 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
font_04_sfnt_off00015235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15235 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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