Malicious PDF — malware analysis report

Static analysis result for SHA-256 7415333d1dd5809d…

MALICIOUS

PDF

54.2 KB Created: 2020-08-10 05:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98f4df38386bd12362ce1b258dc431cc SHA-1: e3ba6fa62141faab32e23d352007cefb8b99cb77 SHA-256: 7415333d1dd5809df05300c2c80bbf74561b24a709ecc17380a64662ce386771
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to a link farm designed for SEO poisoning. One prominent URL, 'https://ttraff.ru/pify?keyword=class+11+chemistry+notes+atomic+structure+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to chemistry notes and the wkhtmltopdf application, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=class+11+chemistry+notes+atomic+structure+pdf
    • http://files.shepherdsbiblestudychapel.com/uploads/1/3/2/8/132814071/b0265d57ab.pdf
    • http://files.penreviews.net/uploads/1/3/1/4/131406960/dizefolu.pdf
    • http://files.harmonyfcr.com/uploads/1/3/1/3/131380847/9910934.pdf
    • http://files.copelandconnection.org/uploads/1/3/1/1/131164009/9389219.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/85875867309.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/colombo_road_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/80773125682.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5958/files/jakixujapiwibezuji.pdf
    • https://cdn.shopify.com/s/files/1/0434/4882/8065/files/55626284529.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/vifaxelemubumamajidag.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6790/files/gowuxatakomo.pdf
    • https://cdn.shopify.com/s/files/1/0450/3647/0430/files/interior_design_magazine_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1458/files/barmac_crusher.pdf
    • https://cdn.shopify.com/s/files/1/0447/9988/5463/files/morfologi_tanaman_belimbing_wuluh.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/75781588978.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://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_off000065c8.bin
1c32cb3557ea6f21c00b001a74b990bb70b427bfc33cf9af18880712f451da2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C8 5452 bytes
font_01_sfnt_off0000782a.bin
6de55477c25980846f6c3b395330e9a846f39f6f2ca7dcb27c1603d76948ffd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x782A 2476 bytes
font_02_sfnt_off00008300.bin
386d424765cdedebdba83e3d90826e6de05455930a9f1f4c4d74df840d6f1367		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8300 15288 bytes
font_03_sfnt_off0000b3fa.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FA 16204 bytes

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