Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ab2e4096f13787…

MALICIOUS

PDF

40.0 KB Created: 2020-11-01 05:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: aec9a005d8c398a8faa31085f47b1164 SHA-1: 8b0d401c354e8367df2316503382a007cec996a6 SHA-256: a4ab2e4096f13787f43f6d8bbde554ce23be311140349dbeaf8a63f7dab38439
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many of which are SEO-optimized PDF documents hosted on various platforms. One of the primary links, 'https://cctraff.ru/strik?keyword=northridge+elementary+school+highlands+ranch', is flagged as a known malicious redirector. This suggests an attempt to direct users to malicious content, likely for phishing or malware distribution. The presence of numerous links and the use of a redirector indicate a link farm attack pattern.

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/strik?keyword=northridge+elementary+school+highlands+ranch In 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/1/0434/3591/7473/files/slenderman_must_die_chapter_7_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96177669-3311-487a-903d-2919cefada2d/bonjour_tristesse_chapter_5_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1666/7814/files/apple_music_player_free_download_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3120/2472/files/lidilovobikabatoru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4949/8797/files/sanrio_iphone_6s_plus_case.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4050/6009/files/sam_ash_black_friday.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8905/0813/files/fishing_reel_sizes_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/gemupemutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ec3e01-328b-4579-b3c2-900c6249db22/geometry_6.3_a_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2088/4374/files/gedomubomaluw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2627/2415/files/sending_large_files_to_kindle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3878/3688/files/gasakepogeretodiwiva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3756/4838/files/sarampion_rubeola_y_paperas.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/jatufizowixipavugobe.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_off000059b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59B6 5424 bytes
SHA-256: dfd0fb3d9f32281c7be194880d60e53d38c0db82ff9e940d895b866b7a40681f
font_01_sfnt_off00006c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C09 11716 bytes
SHA-256: a28fcbb224e00cf7789d7aaa525ff0e760b8b3ea2e52d4ce88dccb8220cbf02b

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