Malicious PDF — malware analysis report

Static analysis result for SHA-256 7176bdbfae72128f…

MALICIOUS

PDF

42.3 KB Created: 2020-08-17 00:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1255b459ccf779f4246871ef590ba5be SHA-1: ac75451f106d01c334e2120b2ae41485cbdd199c SHA-256: 7176bdbfae72128fd96f53996d3949addfdd05e97f38fd42828d1ec6bd5bbaac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO spam campaign, aiming to direct users to malicious sites.

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://ttraff.com/pify?keyword=bhangarh+fort+video
    • http://files.visualsbyhelen.com/uploads/1/3/0/7/130739835/zigutu_xamokamabekewer.pdf
    • http://files.palm-beach-divorces.com/uploads/1/3/1/3/131383821/niraxufetagube.pdf
    • http://files.beerswithourfoundingfathers.com/uploads/1/3/1/4/131406831/womamexovisu-sagekepotak-gusugoduxesif.pdf
    • http://files.lindveit.com/uploads/1/3/1/3/131381204/2ff3e6e1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5639/0559/files/folamepapegew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sagomowaroperovi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/advanced_excel_2020_complete_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/planilla_de_apertura_de_cuenta_juridica_banesco.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6006/files/geradinitanerufusavuru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4580/files/49670286867.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/vufobe.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/pomasuwagaro.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/symbiotic_and_nonsymbiotic_nitrogen_fixation.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/aeschylus_oresteia_agamemnon.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/collage_photo_maker_pic.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000699a.bin
24fd4871a3bdb12d2cc3f024f661324291e9168fd6a4985370628800ac0679b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699A 5068 bytes
font_01_sfnt_off00007ad4.bin
16e8d5dee7592509d702e5eb480999c9f78bf9b366a5e580bd40191dbed631d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD4 9924 bytes

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