Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83dbfe6f55352e4…

MALICIOUS

PDF

48.3 KB Created: 2020-10-06 18:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a16e409521ff188590b3eb80e70c2657 SHA-1: 6bac7b641326473b88172bacdc43eaa1ac3dfc4d SHA-256: b83dbfe6f55352e44e01d1b801b17deb45a6e1b5eec77d31a31c1edce6742f04
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it redirects to known malicious infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files. The document body contains a URL that appears to be a lure for search engine optimization, which is then followed by a list of other PDF links.

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.link/pify?keyword=a+midsummer+night%2527s+dream+quotes+about+magic In PDF document text
    • http://rovidew.friendchristianassembly.com/uploads/1/3/1/4/131452903/mazaxule.pdfIn PDF document text
    • http://files.warleymc.com/uploads/1/3/0/7/130739095/9997351.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/9f8d8baf-6848-4ce6-b9c7-76f37625f824/26007276808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0beb21e-63e3-491e-a6aa-8cbd6e36e09b/47422680722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83fb4586-07c8-4e79-8aa2-bb46ad2808d8/dapejosexuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f121a8-57ec-4020-bacf-419b0945dc0b/nekenuvululovatafiwoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/751976e2-326a-4fd6-932e-a0936ce89234/68694662422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa37242-b188-421f-ad14-3a4f4827a827/zosux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e88c07-7bd6-4d56-a3ad-9ded1cca5852/16316677719.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3510/1850/files/90222257799.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5990/4157/files/nakixojanikimazewuda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4475/5866/files/69151224957.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1512/6685/files/rsvp_cards_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5427/6001/files/who_are_students_with_low-incidence_disabilities.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_off00007edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDF 5608 bytes
SHA-256: a1de30dcf6e7003d15d5f3344bd0281cb5c613e020ce9955ea22df0d8300b103
font_01_sfnt_off000091c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91C4 10208 bytes
SHA-256: e20e6380508547d1df57835da04108ccd76d70cc5d91f473c773726f89af174f

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