Malicious PDF — malware analysis report

Static analysis result for SHA-256 c728cfefda8d49d5…

MALICIOUS

PDF

47.3 KB Created: 2020-11-02 19:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 30697b60b72a440cdac2f45641e98c4f SHA-1: 52f6557ac12b177865a280e1b4271b03cc78c198 SHA-256: c728cfefda8d49d59a65663229c628c2181bae1393bad3ac0cf3a5dc74022bf0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ggtraff.ru/123?keyword=ccsf+bookstore+ocean+campus, which is flagged as a malicious redirector. The presence of numerous links suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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/123?keyword=ccsf+bookstore+ocean+campus In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417406/normal_5fa0306c97088.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://uploads.strikinglycdn.com/files/27705c1a-1aa3-4bc6-8d12-bac362fe5831/402056835.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3353/2837/files/kugojojonaxagukugek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0165/9559/files/30716103638.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/schindler_s_list_guitar_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/movogewoboxupubinemorele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddae2e88-8a12-4acc-8e87-251acde02d4d/linux_command_line_and_shell_scripting_bible_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/5601907159.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/wobiburuzovewar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e046bd84-cfac-4baf-80ad-7d03e7a08f31/xefivusanuxixukesobe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2702/6079/files/third_conditional_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/buddhism_in_china.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad284ea-87f6-43d5-a400-196e7a463f12/expository_sermons_from_genesis_to_revelation.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/snowman_smokey_and_the_bandit_costume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8290/0167/files/demographic_transition_model_worksheets.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_off00006bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF8 5188 bytes
SHA-256: 9df1de5b4d47f642984dc209092c5b8f9a641633c21e6f5984927b8fbef14a5c
font_01_sfnt_off00007d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7B 10812 bytes
SHA-256: b835ccf5415873c27ebe3883e111fefff1e8695e07a4ddafe460b22da05a2c22
font_02_sfnt_off0000a228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA228 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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