Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5358d8236bfec8…

MALICIOUS

PDF

45.1 KB Created: 2020-08-20 19:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ed518c8d5526070b39f5cea4c47a78c SHA-1: 7a6d5c9927443ee6fa55a89f11b6b82d4a91e52b SHA-256: 7b5358d8236bfec843d99f072351f947bf1c6886eb5962958293f6353c4fa6b2
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'business card template' and includes the malicious redirector URL. The presence of a large number of external PDF links, many pointing to Shopify, suggests a link farm designed to obscure the ultimate destination and potentially distribute further malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=business+card+template+ms+word
    • http://surepuje.dreamcastfirepits.com/uploads/1/3/0/7/130775997/kokugok.pdf
    • http://govamam.interdynartis.com/uploads/1/3/1/4/131437502/xepeduwipo.pdf
    • http://files.412studentministries.org/uploads/1/3/1/4/131453465/3649854.pdf
    • http://vezekaker.salsa2013viiisesquiannualconference.com/uploads/1/3/0/8/130813612/sotanasa.pdf
    • http://files.clwindowwashing.com/uploads/1/3/1/0/131070195/mozavudefarutu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3332/7776/files/vibowepifofavobi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2546/3456/files/anjaam_movie_video_song_tinyjuke.pdf
    • https://cdn.shopify.com/s/files/1/0431/9150/0961/files/mavuvukadavikunom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18813115042.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9078/files/descargar_abecedario_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/tebolokogoge.pdf
    • https://cdn.shopify.com/s/files/1/0435/0240/3750/files/server_rules_discord.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1194/files/53852146081.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/vamoxipexukazenuweg.pdf
    • https://cdn.shopify.com/s/files/1/0450/0570/1284/files/neumonia_viral_y_bacteriana_en_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0436/2492/3298/files/bticino_magic_catalogo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0993/1426/files/achyutashtakam_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6866/0643/files/80696617897.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6149/files/port_san_luis_fishing_reports.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_off0000703a.bin
f5a51bbef03e81af2411bcff967a4f6a91ccb4c1bbf8d94191a8672ce02fd321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703A 5360 bytes
font_01_sfnt_off00008265.bin
7e8436d289a98a7f201cc1a7de368521b0b5c0c70eb2f05aa5ab2f61d444b88f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8265 10880 bytes

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