Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f526e683dcb3be…

MALICIOUS

PDF

42.4 KB Created: 2020-08-14 06:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 889d0c0bb619c500fe62bfdd84d406e0 SHA-1: 097a37dd01da8a8b4daf5ed21a3e50d7d8d101b9 SHA-256: 82f526e683dcb3be845e07cdf1067810113a5399e0bddfef4a29b2901f860536
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm infrastructure, and one critical link redirects to a malicious URL. The document body, though heavily obfuscated, contains the malicious URL and other links, suggesting an attempt to trick users into visiting potentially harmful content. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=vehicle+check+sheet+images
    • http://files.anasofiarodrigues.com/uploads/1/3/1/3/131383294/wajoraj-govotadufoz-favowoka.pdf
    • http://fapaxusav.withlovezoerose.com/uploads/1/3/1/3/131380005/banomidonunediw.pdf
    • http://files.adityagreens.com/uploads/1/3/0/7/130775922/3866e5bb68694.pdf
    • http://files.playingschoolforlife.com/uploads/1/3/0/7/130775135/waxuneragotobajidi.pdf
    • http://files.ben-noble.com/uploads/1/3/2/7/132740350/xufakifutadonumoma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5759/4016/files/bp_oil_spill_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0435/0436/9816/files/delakujiroxodapep.pdf
    • https://cdn.shopify.com/s/files/1/0432/8279/2606/files/fesupidegufarusakoxita.pdf
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/45234346757.pdf
    • https://cdn.shopify.com/s/files/1/0433/9066/4860/files/69069659739.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/roxudoropere.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/35290557970.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/7739207000.pdf
    • https://cdn.shopify.com/s/files/1/0432/2322/0392/files/actuarial_science_uct.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1162/files/the_walking_dead_s06e04_kickass.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7247/files/3912359031.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7872/files/genapujoxuzelemudid.pdf
    • https://cdn.shopify.com/s/files/1/0437/7097/0274/files/53860429113.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/welafum.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_off0000696b.bin
aae4714e077fbee377a5ee291ef2f8dcee0d3f7c4dd96e971b41ff13f2950782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696B 5148 bytes
font_01_sfnt_off00007acf.bin
75c628288e99cd34b6d15baf65a030a8fbaa49f738c445a187aa1b93f92cc847		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACF 9992 bytes

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