Malicious PDF — malware analysis report

Static analysis result for SHA-256 8299de0691161fd6…

MALICIOUS

PDF

43.5 KB Created: 2020-10-15 15:39:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 116c5ba7924f3eff6dfdbdd8a96edab8 SHA-1: fd947ac646e09a83842edc1e789e368b9819ead5 SHA-256: 8299de0691161fd6f5abcf772b7a94e74e9e2290ba0b9d91f9fcb39111b57202
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 document body, though heavily obfuscated, contains references to URLs and appears to be a lure for users to click on these links. The ML classifier also strongly indicated 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://gettraff.ru/123?keyword=saucony+women%2527s+size+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f87247f7a7ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f874b7bd59aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f86f418c6c17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f86f945b34f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f86f955c6849.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/jibepare-vudaramuzi-refirezagulele.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/zanadutut_wexudafenatogun_jetomefoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f8722dc4ab10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f876c17dcf41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f86f4f7e91f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f875240c7548.pdfIn PDF document text
    • https://site-1041206.mozfiles.com/files/1041206/30987163769.pdfIn PDF document text
    • https://site-1040101.mozfiles.com/files/1040101/nujap.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/1/0485/0204/6882/files/lindas_diet_delites_low_carb_biscuits.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2574/3521/files/divirabis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce275c05-5de8-4586-b950-e896d01f9eda/kugavawatajafun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/677b180d-c3f5-40f6-bbe9-1162e88dc045/46190776805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e14269-1916-4d72-aec7-3188b7d9c444/wiwevederigipewuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c6989c-0013-4ee0-acc8-013b2d3c3208/2555407378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39618709-e0ad-47cc-a2ab-f33573059c7b/pigotijinejumi.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_off00006b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B58 5512 bytes
SHA-256: 320021f5650cadbe90b6f97370ce850b49beb43ec4838fe2881ab89fc9349596
font_01_sfnt_off00007e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E21 10276 bytes
SHA-256: 55e41262f6986961205795ee303d88f24232c267d3d0d25a14080d878e494747

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