Malicious PDF — malware analysis report

Static analysis result for SHA-256 afeac687cd0964e0…

MALICIOUS

PDF

42.6 KB Created: 2020-08-15 04:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30ecf849271b5c0a02e495bf8401986a SHA-1: aea1b184db1e0fd851862e4b026f8b2ffc0e5e7f SHA-256: afeac687cd0964e088bddeea385ad8b9b522e9402eec5b696c54d6929243b27a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body itself is heavily obfuscated but contains the same URL found in the heuristic. The presence of numerous embedded links, many pointing to a redirector, suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution.

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.ru/pify?keyword=controle+da+administra%25C3%25A7%25C3%25A3o+p%25C3%25BAblica+pdf+estrat%25C3%25A9gia+concursos
    • http://files.johnfaben.com/uploads/1/3/0/7/130738568/4744957.pdf
    • http://files.flexusdanceco.org/uploads/1/3/0/7/130776644/6959361.pdf
    • http://files.positivepets.org/uploads/1/3/0/7/130775220/4e94cf.pdf
    • http://files.liveandletdieshow.com/uploads/1/3/1/4/131409009/zuzikal.pdf
    • http://parinu.criminallyinteresting.net/uploads/1/3/2/8/132814930/7848017.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lamafavikunidamekisuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/letusorusomefegovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4206/9918/files/katojamisadeji.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/rfid_based_access_control_system.pdf
    • https://cdn.shopify.com/s/files/1/0435/9343/3246/files/aeroponics_system_design.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5050/files/fepulowasujenu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0530/3190/files/87536130735.pdf
    • https://cdn.shopify.com/s/files/1/0437/1274/1529/files/3568520600.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/kelofimosofijubaxirexet.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5919/files/adobe_scanner_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/lezupatas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000575d.bin
fe2efb5bf9a3147dbb443a7aae25fbc8ea0bf96dacd8b3530a53d692f6a8df53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x575D 6280 bytes
font_01_sfnt_off00006b3c.bin
fa38b3f8d6cf850b9e5cbd160b895a1cc0b1b3027be490b3a415897e93d08dbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3C 10452 bytes
font_02_sfnt_off00008c2f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2F 4324 bytes

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