Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60b735c1562dd4b…

MALICIOUS

PDF

62.5 KB Created: 2020-08-05 01:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6394015f1a1019060237225ddfa8c40 SHA-1: 629b2911b5babbd0d74afcdd45aaa39c21879f70 SHA-256: b60b735c1562dd4b5b296c63bebb3eb1edabe34f07b92b9d183ea5a2b0d86040
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that point to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'comparison of clustering algorithms in data mining pdf' and the URL itself, suggesting a lure to download a malicious file disguised as a research paper. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of this PDF. 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=comparison+of+clustering+algorithms+in+data+mining+pdf
    • http://files.blingbyshe.com/uploads/1/3/0/7/130776828/9360601.pdf
    • http://files.trixwithay.com/uploads/1/3/0/7/130775982/xejatigu.pdf
    • http://files.thehulahut.ca/uploads/1/3/1/4/131453086/xebadonod_bitazuzut_rigazinare.pdf
    • https://cdn.shopify.com/s/files/1/0433/4249/5899/files/texas_advance_directive.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6987/files/xakikipep.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/pebumu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6803/0102/files/63642722824.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/vatorukuveza.pdf
    • https://cdn.shopify.com/s/files/1/0438/0078/9154/files/mpeg_streamclip_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/munisaludesarekibafukeri.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9445/files/pdf_split_and_merge_download_offline_installer.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/probability_lesson_plans_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fexofedome.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/javascript_random_number_in_range.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/1492933463.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_off0000a34b.bin
628d6c009b64f63f76463f13db08fac4aaf3e137918e68e460bdb4d0943ed288		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA34B 5476 bytes
font_01_sfnt_off0000b5b0.bin
524fc474ea1a487b3c7628cfa2eb0d41d2f5459dcf110df18d01a13c74d45b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B0 12504 bytes
font_02_sfnt_off0000de46.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 4324 bytes

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