Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e49ec6169770a1…

MALICIOUS

PDF

55.3 KB Created: 2020-08-06 16:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 504a3acf6c30712b9843bf57eea1961d SHA-1: f48e151dc98b25b4054e799185fd1052e1f5f24f SHA-256: 82e49ec6169770a13bc5112e07c4f9af093a9b2103949843dad968e7a2353450
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading books. The presence of a malicious redirector and a link farm suggests an attempt to drive traffic to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=history+books+download+in+urdu+pdf
    • http://files.milescollegesportshalloffame.com/uploads/1/3/2/6/132682564/927fa8c8a9.pdf
    • http://files.jamiejordansings.com/uploads/1/3/0/7/130738607/4964679.pdf
    • http://files.mehrbach.com/uploads/1/3/0/9/130969458/nenuvuvodopan_depowuzudofizer_muxanogowimuge_fatabupitowi.pdf
    • http://files.gemgrooming.com/uploads/1/3/1/4/131409508/kuvojazogos.pdf
    • http://files.virtualshow.org/uploads/1/3/1/4/131408172/6208442af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2183/6193/files/96026549258.pdf
    • https://cdn.shopify.com/s/files/1/0436/1220/9315/files/the_nice_guys_putlockers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7372/files/el_caliban_y_la_bruja.pdf
    • https://cdn.shopify.com/s/files/1/0438/4312/5413/files/60732330731.pdf
    • https://cdn.shopify.com/s/files/1/0432/9704/6696/files/zixewiveve.pdf
    • https://cdn.shopify.com/s/files/1/0436/1915/6130/files/49808523110.pdf
    • https://cdn.shopify.com/s/files/1/0432/7564/9180/files/47673770130.pdf
    • https://cdn.shopify.com/s/files/1/0434/0200/2584/files/71057467238.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/difudafidusebazul.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1147/files/12373535227.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a45a.bin
219d52ec33beaf8c1a4239af53ccb7c8ba54b4dd643b50df32ff6f77e35e6bb9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA45A 25500 bytes
font_00_sfnt_off00006efe.bin
a084b755317b51ea985224f9fc6a1cf42147a4c93d26d0b0b1c435d1192ff973		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFE 5392 bytes
font_01_sfnt_off00008174.bin
9d0720c1ff586e99acb5464abc0c5dd349433e429c82326e52bb2d121fd4b76d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8174 10124 bytes

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