Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b1f31d0b847121…

MALICIOUS

PDF

49.1 KB Created: 2020-08-11 23:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1fa0e3be71cf94a8db873334c36d9a4 SHA-1: 78a23dff28ea584892ea225a6cd31308a66d4679 SHA-256: 04b1f31d0b847121a6d761b5857f471ce78c93c7639f886c9ddffadf5f4633cf
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO poisoning attempt to lure users to malicious sites. 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=bessemer+converter+process+pdf
    • http://wokuf.carwrecks.com/uploads/1/3/0/9/130969465/dovatajewewejudi.pdf
    • http://sumaw.mrsnyderhistoryandtech.com/uploads/1/3/1/3/131383258/7af44fe0ce18d53.pdf
    • http://files.bayareamuslimtherapists.org/uploads/1/3/1/3/131380539/2944981.pdf
    • http://dijewi.angelafree.org/uploads/1/3/0/7/130776031/f11278b4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/8573/9670/files/ruxebubokerolujugub.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/42009185260.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/61789426922.pdf
    • https://cdn.shopify.com/s/files/1/0437/6107/4333/files/area_of_basic_shapes_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1053/1238/files/virogudomuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1200/files/kokip.pdf
    • https://cdn.shopify.com/s/files/1/0448/7793/8855/files/bent_rule_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9009/files/.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38967404473.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/forabizor.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/70950319734.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cf7.bin
cb2774e8a1d58b56fc8b8732f4de8726b04864ef52aa080e5ee45ae913d07739		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF7 4908 bytes
font_01_sfnt_off00007d89.bin
125cd96ec8b2fba3815f6cd4c6d2c4ff1add6f757f5c6d7320735c8b40564592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D89 13832 bytes
font_02_sfnt_off0000a976.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA976 4324 bytes

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