Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a44e4e5f5d3e1c…

MALICIOUS

PDF

52.4 KB Created: 2020-08-02 20:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b25c526034ea655cad2818a8931a5882 SHA-1: 8098b1b3756b401b5a078f9e4d21a51754ffb781 SHA-256: 05a44e4e5f5d3e1cc6e487b5b0043cce163e06ea6781fe16f67baee7028843fd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=%25D0%25B3%25D0%25B4%25D0%25B7+%25D1%2583%25D0%25BA%25D1%2580+%25D0%25BC%25D0%25BE%25D0%25B2%25D0%25B0+5+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581, which is likely used to host or redirect to malicious content. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt, further indicating malicious intent.

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.com/pify?keyword=%25D0%25B3%25D0%25B4%25D0%25B7+%25D1%2583%25D0%25BA%25D1%2580+%25D0%25BC%25D0%25BE%25D0%25B2%25D0%25B0+5+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581
    • http://files.instafiltersstory.com/uploads/1/3/2/7/132741397/5847034.pdf
    • http://files.kleindorf-art.com/uploads/1/3/0/8/130814226/1061b6c9ad81.pdf
    • http://files.stonerfitness.club/uploads/1/3/1/4/131438079/9429020.pdf
    • http://files.rrcleaningplus.com/uploads/1/3/1/0/131071249/pamojozulame_judagujavenavex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5897/8207/files/xewodugoruwizoniwarosa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/buvuwefevojosilejasiro.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3743/files/kumanifadudiva.pdf
    • https://cdn.shopify.com/s/files/1/0437/9456/3221/files/61324541973.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/wokugur.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/xolenomexesinademexom.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/xetapima.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6071/files/a_briefer_history_of_time.pdf
    • https://cdn.shopify.com/s/files/1/0435/6826/7423/files/jediganisokaribukefefi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4246/4163/files/12193629478.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/54819550278.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/57982128438.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/63982821177.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cb4.bin
3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB4 6440 bytes
font_01_sfnt_off00006ca8.bin
c8bb5c8e1cf102d05ae151d504b48b157330ae8e75ea7b3506e09a9c0cf4c72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA8 5564 bytes
font_02_sfnt_off00007f9b.bin
0c031443cb0c32cd7ce465fc13729dfeeb9ae430d265d13ea52a4bc0209889a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9B 14748 bytes
font_03_sfnt_off0000ad66.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD66 16036 bytes

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