Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c93b88b1b9b3340…

MALICIOUS

PDF

48.0 KB Created: 2020-08-21 23:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09a381de5f1a335cc990f3a42e151a96 SHA-1: 73bf54c7a730dbdb509d656614f362c23e7d4f1f SHA-256: 8c93b88b1b9b33404d8eb02f7c735e1b7ba0b6798e6e5e46b7d16f4de7f826f7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to external resources, a behavior flagged as a PDF link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to 'export excel sheet to pdf using vba' and includes the malicious redirector URL, suggesting a lure to a phishing or malware distribution site. No scripts were extracted from this sample.

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.cc/pify?keyword=export+excel+sheet+to+pdf+using+vba
    • http://nudoteb.savannahspraytan.com/uploads/1/3/1/6/131606027/67983728f0d3630.pdf
    • http://files.mfengshui.com/uploads/1/3/2/3/132303118/11eb4f49d.pdf
    • http://files.ak4h.org/uploads/1/3/1/8/131871814/08e0f7a.pdf
    • https://cdn.shopify.com/s/files/1/0447/5171/6503/files/infrastructure_engineering_and_construction_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/zewudewukubifaje.pdf
    • https://cdn.shopify.com/s/files/1/0429/6015/8873/files/kaleshwaram_project.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/bitmap_get_type_android.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/avg_secure_vpn_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/suvusuwitaxezufalufav.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/72554887759.pdf
    • https://cdn.shopify.com/s/files/1/0433/4151/2855/files/kuvak.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/lusapekonisuvuwezuzibediw.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3950/files/blanc_manger_retro.pdf
    • https://cdn.shopify.com/s/files/1/0452/1289/3344/files/texas_dental_jurisprudence_exam_answers.pdf
    • https://cdn.shopify.com/s/files/1/0453/4127/8363/files/fisco_agenda_2020_online.pdf
    • https://cdn.shopify.com/s/files/1/0434/6645/7254/files/pilolado.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006616.bin
edf02c0931325c1d86426c73062b028cc09dec7ea0c6fa2a47a470cc44389955		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6616 5524 bytes
font_01_sfnt_off000078d4.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D4 1800 bytes
font_02_sfnt_off00008164.bin
61336b851c3347efed5503cbdcc99427319175f1b9a765c17e5e1e54d946ac23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8164 10448 bytes
font_03_sfnt_off0000a3f0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3F0 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.