Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f234264e29f0626…

MALICIOUS

PDF

125.7 KB Created: 2020-08-11 03:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 568c67e23a54b39ad38e81bc8b8f88fd SHA-1: b5788dcad36de151174a28fd0b2ef9bd54182563 SHA-256: 5f234264e29f0626196c312f6de8c4d3772272bfa1f1f5c673b7764ed525fcef
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a financial audit report, likely a lure to encourage clicks. The presence of numerous external links, many pointing to Shopify, suggests a link farm intended to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=ejemplo+de+auditoria+financiera+de+una+empresa+pdf
    • http://vozadeliv.radanjana.com/uploads/1/3/0/8/130874359/f0950.pdf
    • http://files.ipsproptech.com/uploads/1/3/1/1/131164424/ditalalamudo.pdf
    • http://files.learnenglishspelling.com/uploads/1/3/0/7/130739376/0e1b31.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/8986/0510/files/higher_category_theory.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1245/files/vexoremazesurugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/42074304156.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/aahe_manohar_tari_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8734/files/21040258986.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4899/files/banting_diet_plan_for_weight_loss.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/chernobyl_disaster_summary.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/outlook_preview_handler_error.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/57661303480.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/94844966085.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017d49.bin
f6176642badf23d3b859140f980e33ed2197779d6d42f78889c7ab8713aa4f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D49 2624 bytes
font_01_sfnt_off000187b0.bin
aaeb1ed18880c493bceea200f42c117d46746c1151eb42dfecb590047a958367		 pdf-font-stream PDF embedded font (sfnt) at offset 0x187B0 5216 bytes
font_02_sfnt_off0001995a.bin
b7425685b7e8e21ffb7e62aa0595a6f32a4a35453f610a9382355d7474dd3bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1995A 12988 bytes
font_03_sfnt_off0001c36c.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C36C 16204 bytes
font_04_sfnt_off0001d899.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D899 4324 bytes

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