Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dff4033828fb7d…

MALICIOUS

PDF

60.5 KB Created: 2020-10-31 08:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 28e085aa3c5bb69e5acb4563ea2d8c76 SHA-1: e1c54a7bdaf02ca08900c67609e0630416be74be SHA-256: c9dff4033828fb7dae42132a00a97f1aae0524f9052d00eb57a144e5680f586e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of a large number of external PDF links also indicates a link farm or SEO manipulation tactic.

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.com/pify?keyword=atomic+theory+timeline+questions+answer+key In 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://cdn.shopify.com/s/files/1/0432/2574/3521/files/64095562534.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4130/0380/files/26669186132.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9629/4051/files/soziraravafiwuwawomu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3255/8791/files/video_player_library_for_android_github.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8340/8578/files/craigslist_staten_island_babysitting_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/832af94d-186d-450f-9b9e-67080fde37bd/majavakasisuxeniwixifen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1194/0767/files/tuwusemul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f3565c4-e2ca-42de-9c40-d2f6bec685ed/pefadatajokiluluk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6341/9302/files/jasofukef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7981/0203/files/39436617335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df186eb8-8f83-4682-b5e8-69c459aa0061/rusuzamodefudobibilepej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e830d97-b42e-404d-8481-3f2e37848643/kirikamozutezavuxofimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/821fee64-3fc9-44a6-9a03-befdc3e45889/33063804909.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5505/3472/files/dc_comics_legends_android_gameplay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3752/3619/files/95833541568.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FAF 5296 bytes
SHA-256: 86a82cf084bd37417b42ccd73385c302a89387b9c61c782f030cf1ac1a903bba
font_01_sfnt_off0000b19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19C 10896 bytes
SHA-256: b364b4c9530575a75c3bbd0266b09e035dbb0f630bbf885512ccc65eaa5a8529
font_02_sfnt_off0000d66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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