Malicious PDF — malware analysis report

Static analysis result for SHA-256 29335c8e5242d778…

MALICIOUS

PDF

74.8 KB Created: 2020-10-31 06:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54bf353d591815e4f2bf8c4c125b199b SHA-1: d61b59203bda3b4ee13c37ab28da4cc4fa627586 SHA-256: 29335c8e5242d77855a3c66d7771d90aff374174e0fcd4c38853a2035c1ccba4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious PDF files. The primary malicious URL identified is https://cctraff.ru/123?keyword=bostitch+air+compressor+manual, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to a 'Bostitch air compressor manual', suggesting a lure to entice users to click the malicious links.

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://cctraff.ru/123?keyword=bostitch+air+compressor+manual
    • https://zavomafig.weebly.com/uploads/1/3/4/3/134356936/zumivogo.pdf
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/bijokidife-nenevuvitokoj.pdf
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/d49ce03b.pdf
    • https://rosofofupamufi.weebly.com/uploads/1/3/4/3/134364257/fec2ec0d.pdf
    • https://zumegarilafexiz.weebly.com/uploads/1/3/4/0/134096691/6767043.pdf
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/e14fd777dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d2711a3c-92de-4444-8e5b-fb0302043cb7/doliremis.pdf
    • https://cdn.shopify.com/s/files/1/0440/3704/6422/files/koppen_classification_of_climate.pdf
    • https://uploads.strikinglycdn.com/files/2ea69cea-7e85-4a37-80f5-335333d25b45/gutojarute.pdf
    • https://cdn.shopify.com/s/files/1/0503/0379/5394/files/55858389455.pdf
    • https://cdn.shopify.com/s/files/1/0483/0534/0611/files/zitazegolovepowuz.pdf
    • https://cdn.shopify.com/s/files/1/0476/8307/6262/files/etiologia_del_cancer_de_mama.pdf
    • https://uploads.strikinglycdn.com/files/0bc022b7-b0c4-441b-bc76-215681992181/mtv_unplugged_nirvana_full_album_download_zip.pdf
    • https://cdn.shopify.com/s/files/1/0431/9107/4976/files/aplikasi_edit_video_youtube_terbaik_android.pdf
    • https://cdn.shopify.com/s/files/1/0505/4742/5474/files/biology_11_frog_dissection_guide_answers.pdf
    • https://cdn.shopify.com/s/files/1/0501/2337/4785/files/wiring_diagram_for_hampton_bay_ceiling_fan_switch.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_off0000e5df.bin
14733b895b04ee08b997f1936e6d206598ed02336dca409aa9c874dc24672175		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 5224 bytes
font_01_sfnt_off0000f778.bin
3e866885dfbb1842bb7565eb852bfc3bb12d8f503919acd7f47796cc0612f05a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 12296 bytes

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