Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef593175b2f5e84…

MALICIOUS

PDF

56.8 KB Created: 2020-10-17 08:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 5a78082b966ce76eb85390e1c3abaa35 SHA-1: 92b904276c9df21f21310f599a84d2ba388d8c83 SHA-256: bef593175b2f5e8462afa9a5e893043bed7f15e514e3e9528b0f53e56207b6f6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Weebly-hosted PDFs, indicating a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?keyword=la+belle+et+la+b%2525C3%2525AAte+pdf In PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/gelitu.pdfIn PDF document text
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/pavuzajalodewe.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/1138424.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vanojiraxajerubefiza.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/ebaf340.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/25d02f65.pdfIn PDF document text
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/c016c38009c12.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/5223067.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/domovodibaposix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f871aa021897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f8a7ae373460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f89ee77c34ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f89a190801ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5f8754cd99803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f87f1116055d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f87d3dfabf93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f88dc6ff0f44.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/1/0486/0153/0526/files/18014609813.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2658/6522/files/giguzagozuxetuzagute.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5389/3782/files/35516018904.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/android_clock_widget_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2468/1640/files/saxilokotiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/8676/0086/files/lumosadipatelatogin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7631/6053/files/gray_elementary_school_tn.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/math_in_our_world_third_edition_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0138/0501/files/exterior_angle_theorem_calculator.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_off00009b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B71 4992 bytes
SHA-256: c7fa155e901e8bc7ad624214c693446b6053faab4e41615738616f7ca5c65178
font_01_sfnt_off0000ac3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3D 12748 bytes
SHA-256: 1e7b50ec761db2f0612e554a63f9e10023723027754778e430495cdde8154ef8

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