Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0a98583e03f9c1…

MALICIOUS

PDF

49.3 KB Created: 2020-10-03 05:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a3e4167fac62a27068e7f3b60ca15460 SHA-1: f977c8646a1a821f58b6b16c1fb79d25d6c94a81 SHA-256: 4b0a98583e03f9c1febf38bf50fff666178e56496031243d429fa71d293ec59e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of links to external PDFs hosted on numerous disposable domains, indicating a link farm likely used for SEO manipulation or to distribute malicious content. One of the embedded URLs, https://cctraff.ru/pify?keyword=black+eastern+indigo+snake, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=black+eastern+indigo+snake In PDF document text
    • http://files.onewhoweaves.com/uploads/1/3/1/3/131379615/8315263.pdfIn PDF document text
    • http://files.healingbottoms.com/uploads/1/3/1/1/131163563/xuwobetitugisez.pdfIn PDF document text
    • http://gunavux.jenroweaicp.com/uploads/1/3/2/7/132741100/bapimoj-didivopefum-sapiduraju-wiwejakidexof.pdfIn PDF document text
    • http://tunizal.monavalehospitalauxiliary.org/uploads/1/3/1/4/131408899/d8c12f03e2b3f74.pdfIn PDF document text
    • http://files.spinecarechiropractic.net/uploads/1/3/1/3/131383255/wukupunijobofewutos.pdfIn PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/mojujoredirulozilo.pdfIn PDF document text
    • https://site-1038438.mozfiles.com/files/1038438/42416729594.pdfIn PDF document text
    • https://site-1036858.mozfiles.com/files/1036858/34718858367.pdfIn PDF document text
    • https://site-1041284.mozfiles.com/files/1041284/40952961090.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/0828349b-8a1c-4c9c-aac4-9557577b4d1e/31273163489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87824533-f358-49c8-9d0b-2e54deeecc77/wumud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16d1c70-cf3d-4597-976b-210d2ace46d5/48716706593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe16962-edd3-4f51-99bf-552127425825/13695770040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf55e41-86d8-4011-8d78-b15034c43326/56653530946.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2974/9145/files/kowuzudenijijavasoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/liramuzufisa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5587/6762/files/69288435406.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/gii_phng_trnh_bc_2_trn_excel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5791/3762/files/gonzalo_rodriguez_gacha_net_worth.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_off00007e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0C 5220 bytes
SHA-256: 1ac62adb5a5941bf78c59baf084da056ba91dac484318e3df77fcb8f020714fc
font_01_sfnt_off00008fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDE 11728 bytes
SHA-256: 1f8f8eded444b927166da0f6496e6a03c130bc0cd3cd50940be786eb778848d3

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