Malicious PDF — malware analysis report

Static analysis result for SHA-256 77daf310d48ed6d2…

MALICIOUS

PDF

36.0 KB Created: 2020-08-13 00:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26a8e9fc116fdbf91edb112a442ef8a2 SHA-1: 101b375d847d0329d96af79f2b05e459ca9ebb28 SHA-256: 77daf310d48ed6d2dc39e32cfa02dbd84052585c6ae3cb2e904c5120a6a50377
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains the same URL, suggesting an attempt to trick users into visiting a malicious site. The ML classifier strongly indicates 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://ttraff.com/pify?keyword=room+on+the+broom+activity+book+pdf
    • http://files.marlobarrera.com/uploads/1/3/1/4/131408581/8438066.pdf
    • http://files.sunfasteners.net/uploads/1/3/1/8/131857631/likokiwesedol-kupujizuv-lelilen-zatisezeweka.pdf
    • http://files.yogawithved.com/uploads/1/3/1/3/131379844/f1667.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/8866/7033/files/ballade_pour_adeline_piano_sheet_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/pusigarebisawosadomotowe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/25640547066.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/southeast_asia_political_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/9186/0379/files/roboxebopekobosejawelenum.pdf
    • https://cdn.shopify.com/s/files/1/0431/7741/0720/files/24414742806.pdf
    • https://cdn.shopify.com/s/files/1/0435/8265/2579/files/tsm_battle_pet_string.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0678/files/ginuza.pdf
    • https://cdn.shopify.com/s/files/1/0433/3531/9702/files/attestation_employeur_cpam.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2749/files/nalegidutazewukoxido.pdf
    • https://cdn.shopify.com/s/files/1/0438/3742/3776/files/banking_awareness_book_for_ibps_po.pdf
    • https://cdn.shopify.com/s/files/1/0434/7936/7846/files/webaxoxuwizexabijamig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000447a.bin
751de39b8f72843e8a17aa75f42d25d93f4396978502157aa3c3325b4db28389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x447A 5348 bytes
font_01_sfnt_off0000567d.bin
6b241eaf8e4f419af7a1f94a73f6b7c18f7fae412586b9c3f2159651d42321c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x567D 8924 bytes
font_02_sfnt_off000074fd.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FD 4324 bytes

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