Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d461e3e25e7b356…

MALICIOUS

PDF

46.3 KB Created: 2020-08-31 05:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db795bf295d8c4bce1df071fa2151837 SHA-1: 9e607d3e3293c731a4e8aefba0e198172d533811 SHA-256: 5d461e3e25e7b356f45d92fbafe2346fe434dbd5dca4f8fdc51d71264e5647ad
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a primary malicious redirector URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to downloading software, likely a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded links to external PDFs suggests an attempt to manipulate search engine results or distribute further malicious content.

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.me/wix?keyword=descargar+opera+mini+handler+internet+gratis
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83759083977.pdf
    • https://cdn.shopify.com/s/files/1/0433/0074/9467/files/rozozimorulomolizunev.pdf
    • https://cdn.shopify.com/s/files/1/0435/8550/3393/files/93669944997.pdf
    • https://cdn.shopify.com/s/files/1/0434/5413/6473/files/probability_and_statistical_inference_9th_edition_solutions.pdf
    • https://static.usrfiles.com/ugd/3dd68e_776bbe9be8ab4872b2747da827266631.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bddd9dbab824720ad073600196511af.pdf
    • https://static.usrfiles.com/ugd/33a16d_f05c3a5d805244eeb1d317013512c925.pdf
    • https://static.usrfiles.com/ugd/03ae60_4572d34cf8df46dd87bbda51d4a2f972.pdf
    • https://static.usrfiles.com/ugd/67e251_1fb50ed9d47b42be8de4794d0fa99964.pdf
    • https://static.usrfiles.com/ugd/299074_bb157b3cdc8f4f17a74d29dc0a3b15ac.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_bd9cec9c1d7b429a8f5858974edeeefa.pdf
    • https://static.usrfiles.com/ugd/df4650_cf3350954d7e48a4876f89642d7a4b17.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/96992455154.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/penuwit.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0481/files/show_chrome_accessories.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f10.bin
d066c8a48d9dd2c41123c94cf4842f907e5ecb20445425393244f7f28f86044f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F10 5488 bytes
font_01_sfnt_off00007186.bin
4e0024e10f6b8339a3128b5e9e6c0677566f47e053122e937d32631aa7dca15b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7186 10800 bytes
font_02_sfnt_off0000952d.bin
cbd3aa84ba043481ac21a3bc233964a045cc84cc69df6c0bcf2d2e59fdd9448d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x952D 16484 bytes

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