Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16a87c9f9d07696…

MALICIOUS

PDF

42.4 KB Created: 2020-10-15 00:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e1525df828096003c59f1ac23e108b1 SHA-1: 7350c2fb5c3dacaa91a0155b77b5936b4afbb563 SHA-256: d16a87c9f9d0769602c1e446ac3480d4456a3f63c5e2771223679f41cc3d3117
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is part of a link farm designed to host numerous malicious PDFs. The document body, though heavily obfuscated, contains the same search query and URLs found in the heuristics, suggesting a lure to download potentially unwanted or malicious software. The ML classifier strongly indicates maliciousness.

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/pify?keyword=jio+music+apk+old+version+apkpure In PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/limadizade.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/punadax-kazugokov.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/fizusirepo.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/winepogor.pdfIn 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/1/0434/7327/2996/files/whose_autobiography_is_titled_as_unbreakable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2451/7790/files/18278661123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/302fbfd2-73bc-4e61-ab47-0d25f043c6a8/2716969239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b5936be-165d-4a87-b3fd-5a0262f89d48/46740518398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266ba776-6c53-41e2-b443-d5c7af3f112f/wejufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9031e03-4b36-4dbf-95b5-cb262ef14c61/35297045744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e151943a-cc38-42bb-aa79-67db5cbcf9ea/nidisasabef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1254d650-354f-49de-bd73-9dae4090f46a/27480359247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6eadfa4-4ef2-499f-bab9-96b48bf70bc1/jamavibazajuzuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3041/3980/files/62997682235.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0271/4014/files/gta_3_android_obb_file_name.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/3838/4543/files/belated_happy_birthday.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/2988/0981/files/totofeja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2345/6666/files/truearth_healthy_foods.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0124/9444/files/forms_of_government_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1152/2727/files/the_muscular_system_crossword_answer_key.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_off00006724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6724 5332 bytes
SHA-256: a701a8efd50e08c19e820642db8b35ef1cb579c6b35139a750889727e63f929d
font_01_sfnt_off0000793c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x793C 10184 bytes
SHA-256: cc65504ee88da37796998623ee063585a8e74350abf2412c32ca84e1eaaad25e

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