Malicious PDF — malware analysis report

Static analysis result for SHA-256 6817313925c5fa6a…

MALICIOUS

PDF

138.9 KB Created: 2020-08-03 01:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aa5a5f48c90e5300f1a7614440148eb SHA-1: 51f58a62082102d7d741368159bd175633668b05 SHA-256: 6817313925c5fa6a11161cd8d46a015cd35d8173d395f02295239a7067e340fc
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a phishing or malware download site. The document body, though heavily obfuscated, contains text related to 'keyboard layout pdf' and the authoring application 'wkhtmltopdf', suggesting a lure. The presence of numerous external PDF links, many pointing to Shopify, indicates a link farm strategy, potentially for SEO poisoning or to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=keyboard+layout+pdf
    • http://files.brandonrettke.com/uploads/1/3/2/6/132680905/7319581.pdf
    • http://files.csdesigns.com/uploads/1/3/1/8/131856435/suranexejedajixuzuxe.pdf
    • http://files.markparadispolitics.com/uploads/1/3/0/9/130969993/nuvomejemesu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jewepogepavab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94215193789.pdf
    • https://cdn.shopify.com/s/files/1/0437/0546/7035/files/algorithms_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/buteluwarupumipuvofibuban.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/70418702872.pdf
    • https://cdn.shopify.com/s/files/1/0434/3696/6055/files/salalovovisewepu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3462/3643/files/baganijixoniledosasa.pdf
    • https://cdn.shopify.com/s/files/1/0436/2688/9369/files/18816999523.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3907/files/47973101871.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHong
    • http://www.geocities.com/dnhhng
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001829f.bin
a44d2a765592d5065573a6dfb9ef204e3d091ea0ae068593439dfe6cb3f006bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1829F 11148 bytes
font_01_sfnt_off0001a688.bin
1acb9b08b7487b9cc1a95811a70d62b847578f7ceeaa23fa0d6eedde8f5479bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A688 5068 bytes
font_02_sfnt_off0001b7db.bin
28c64a9a96de096fb58deee3e40cde904ff8fa436f47df3d0eda38e9cb4f1162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7DB 4408 bytes
font_03_sfnt_off0001c611.bin
2a7effdbf61034ffe3be7a54941142f9e79c10e4f35fb8a0aca7a0d1351e4169		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C611 6232 bytes
font_04_sfnt_off0001d736.bin
8566253d14b4031288b383938ccbbecac2f6920202cbd2f0668d6f0507fa020b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D736 14260 bytes
font_05_sfnt_off000204f6.bin
df2f14104eff5a430f3eec747f94ac7c53c16d9f3d272e59e8a780cd99f4c928		 pdf-font-stream PDF embedded font (sfnt) at offset 0x204F6 16944 bytes

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