Malicious PDF — malware analysis report

Static analysis result for SHA-256 146ff1d72739cc5c…

MALICIOUS

PDF

44.7 KB Created: 2020-10-16 22:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 54715179eee32081fc38d5416039849e SHA-1: 23d735c70d269023ea418ebd033317eaaa52d4a9 SHA-256: 146ff1d72739cc5cba40215160112c82ef98113978a9473cfd20730cfd3e4aff
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to 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://cctraff.ru/123?keyword=gold+coast+tv+guide+our+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f89acca71e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_5f8782c7b7741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5f87702212aff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f87845d1d51c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f87142509b40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f8754196127d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f894ae6854c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f8758eace85d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f87a029c39fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f89ebbb1a601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f872223dd312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f87535882ef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f896b3145400.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/1/0430/2602/2557/files/journal_entry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2136/5148/files/lofebaverumivakaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8986/9991/files/fox45_app_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1765/6731/files/kenmore_coldspot_106_water_filter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5224/8482/files/jaxulusezutukevul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2054/8758/files/21954952341.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3973/4946/files/negolemakonofuzogifuvoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5509/9287/files/roach_motel_urban_dictionary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5327/1208/files/lumuletipebeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa6f695-1e6d-40d7-bfe5-7169eb3f3cba/42733364689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08099e94-d562-49f8-9601-dc609d4bc413/58759740383.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_off00006fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBB 5200 bytes
SHA-256: 7f62e9fcf8e4f07418faad8d6979fb11f83568e834946231f6368c2c36a16a0f
font_01_sfnt_off00008181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8181 10428 bytes
SHA-256: 14fc72205beeaa1ad7c93811b191ab998f7ee106e7bf6eb061133e537f30bdd0

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