Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd77d17d42f384d4…

MALICIOUS

PDF

43.5 KB Created: 2020-10-25 18:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3d8be43b7f50785a47c7bdd88aaa4d64 SHA-1: 1a62012954e44e14e5321ae015bb9e2353196699 SHA-256: fd77d17d42f384d49819f16afbef142d35c1195e924ae13bbf4db0a153614021
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL https://ggtraff.ru/pify?keyword=substitute+teacher+cover+letter+pdf, which is flagged as a malicious redirector. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, likely to obscure the malicious redirector.

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/pify?keyword=substitute+teacher+cover+letter+pdf In PDF document text
    • https://zawiferodabubap.weebly.com/uploads/1/3/4/4/134447725/zupekonuzaxirawizame.pdfIn PDF document text
    • https://gemefakopegixi.weebly.com/uploads/1/3/4/3/134309359/vodovuxafanozodivoz.pdfIn PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/fuwuz.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/10e08a402fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_5f930785bfda2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_5f8e29ce50d0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f8acacf49c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5f89399851f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5f8f5f06af826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetare/convert_to_word_text_ocr.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/vizibelov.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/critical_path_method_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/67666412997.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1085/7381/files/daninomatufanusoxezosib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3241/8725/files/22270928221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6572/8920/files/84302764954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4723/8811/files/54716410843.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1626/4090/files/wotlk_retri_paladin_pvp_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/9005/1740/files/17654801391.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8304/5293/files/i_am_paul_walker_tv_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2758/3135/files/sobomebivasezivogikalukel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4378/9727/files/hematology_oncology_secrets_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5328/4008/files/renal_function_test_download.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_off00006ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACE 5544 bytes
SHA-256: c92b20843ad030c2b6a38b16f9739c226e9a188c2826d0328877e95412f65383
font_01_sfnt_off00007d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9F 10312 bytes
SHA-256: 5fa9a6d3d3cce541cb26a2c582f5f1d703e95e3e76f828ffc8d9f41aa01756d3

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