Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc1b7a28845e715…

MALICIOUS

PDF

37.6 KB Created: 2020-11-01 18:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 66417971967db50b7532ed266741a90a SHA-1: 31019c78047c76e756ce3721548d1152c3bbdd14 SHA-256: dbc1b7a28845e71559c4df7ddabe0249c6f3673f69da2b4dd50dd9548f4ddd57
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though partially corrupted, includes the URL 'https://ggtraff.ru/aws?keyword=commas+worksheet+second+grade', suggesting a phishing or redirection attempt. The presence of numerous external PDF links, many with numeric slugs, indicates a link farm designed to distribute traffic or host further malicious content.

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://ggtraff.ru/aws?keyword=commas+worksheet+second+grade In PDF document text
    • https://moxitimufetumo.weebly.com/uploads/1/3/4/0/134040580/wopuge.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/podoposubup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7abcff0f-35b3-4742-ab47-9b8633c61b13/moposipewemilazugipip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6e1dfe-39df-4fcf-ab97-c41cab8c878a/random_vin_barcode_generator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5536/3734/files/xisidivamixopezefib.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/72928520324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306a92d6-f237-4861-a912-ec42f6dd12b4/48391820045.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3368/7721/files/16891486995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/910414e7-5835-4622-a8ab-f76166d6a7ad/hd_dieu_wallpaper_pour_mobile_1920x1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7bc3927-756c-4e41-b362-f99934ff12b2/weathering_and_erosion_worksheets_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7651647-ddc9-4802-a813-0e5323f4d150/asus_t300chi_f1_db.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f90ccf0e-c2cc-4012-a5d8-805ed26e13d2/aa_meeting_list_ocean_city_md.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b164996f-c167-4a10-9bbf-cefd09b156fd/85992244898.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/7046/3646/files/34199723813.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8096/7078/files/things_that_start_with_letter_e.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_off000052aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52AA 5380 bytes
SHA-256: 384bae0688ddfaab75244a8f0e8e7a65321ad6529dd376b7df40f70301ce048f
font_01_sfnt_off000064d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D8 10724 bytes
SHA-256: 382bbab05957f8ed0d411d2647e06f72ff9ada2aced752eb830712fe0cb504ad

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