Malicious PDF — malware analysis report

Static analysis result for SHA-256 17052951b4196876…

MALICIOUS

PDF

43.4 KB Created: 2020-07-14 00:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f172c77f02344d051fb77416f1125fbd SHA-1: 1d44ddf81b57d84fba4c77b9c881799fe30ac237 SHA-256: 17052951b41968765ba01f8df7a32814c64c750fb06cc351b2c382d06c1fcd78
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests an attempt to direct users to potentially harmful external sites, possibly for phishing or SEO spam.

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/wb?keyword=macbeth%20test%20questions%20and%20answers%20pdf
    • http://files.joyandmarquette.org/uploads/1/3/2/8/132814272/6430349.pdf
    • http://files.monroecountykychamber.com/uploads/1/3/1/0/131071295/ponerewesesaw.pdf
    • http://files.thelostartoffemininity.com/uploads/1/3/0/9/130969772/1bf93ebba0976d.pdf
    • http://files.carnegiehouse.co.za/uploads/1/3/0/7/130775080/385af39e3d09.pdf
    • http://files.brianmorrisphotography.com/uploads/1/3/0/7/130775171/62d24.pdf
    • http://files.peterpax.com/uploads/1/3/0/8/130813269/8040566.pdf
    • http://files.susangsterrett.com/uploads/1/3/1/3/131380476/441203.pdf
    • http://files.asisproperties.com/uploads/1/3/1/4/131453024/922a52f0b4.pdf
    • http://files.nyacuchiro.com/uploads/1/3/2/6/132680874/d46b5.pdf
    • http://files.reneeheissart.com/uploads/1/3/1/6/131637307/zasobusopano.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zinisarov424395058.files.wordpress.com/2020/06/xutevenevalupi.pdf
    • https://gusuwabawujo.files.wordpress.com/2020/06/59158336084.pdf
    • https://jiwuvef.files.wordpress.com/2020/07/53660154241.pdf
    • https://wakoloru.files.wordpress.com/2020/06/84860743390.pdf
    • https://jidibabeja.files.wordpress.com/2020/06/66064096008.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/mepidupekewevinawitini.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gojifazuxosupimuron.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/7811470552.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/firirobeluposidofatef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/serananovuja.pdf
    • https://cdn.shopify.com/s/files/1/0432/0700/0219/files/wopilinoxaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/71910939430.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b8e.bin
770b002fde0168b044edd3d77b4ddb55fa0aa7d68e5e575739ca31e8176ba41c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8E 5456 bytes
font_01_sfnt_off00007e18.bin
6661f78a9248b6713399c5d6d356162d158e0fc9ebc46d548ee4f76703e9a158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E18 10004 bytes

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