Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acd10987b51b2e4…

MALICIOUS

PDF

55.0 KB Created: 2020-08-06 15:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f51f461d92ffe46890c15879431d26ee SHA-1: 019355afda848145475ba86b78702bef5f8db573 SHA-256: 4acd10987b51b2e4db86d9f37a3280ad5ba7edd38ea35188f3f98105d81bd9b3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=kitchen+ergonomics+pdf'. Additionally, it exhibits a PDF link farm behavior, with numerous links pointing to external PDFs. The document body, though partially corrupted, contains the text 'Kitchen ergonomics pdf' and references 'wkhtmltopdf', suggesting a lure to disguise the malicious links. The presence of multiple embedded URLs, including the malicious redirector, indicates an attempt to direct the user to harmful 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.cc/pify?keyword=kitchen+ergonomics+pdf
    • http://vojabigi.oregondyslexiainstitute.com/uploads/1/3/1/4/131452922/melununuzijoki.pdf
    • http://files.stevehowell.net/uploads/1/3/2/6/132681293/polozufusor.pdf
    • http://files.jakeperalez.com/uploads/1/3/1/6/131606697/nogasubet-teluz-febegawasiju.pdf
    • http://files.microskytech.com/uploads/1/3/1/3/131378988/morifonuwunosixiw.pdf
    • http://files.dahliaspourhouse.com/uploads/1/3/2/3/132302859/sevipinusutimir-xinimaxiz-jifipat.pdf
    • https://cdn.shopify.com/s/files/1/0434/5842/9089/files/nodojepojomifewovi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2024/files/41798385606.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9109/files/generate_barcode_c.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/robivukuxoronab.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/64666633191.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/35798816332.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0260/files/24047144602.pdf
    • https://cdn.shopify.com/s/files/1/0431/7587/0613/files/fuvojazuvotire.pdf
    • https://cdn.shopify.com/s/files/1/0430/4368/4503/files/burojifoniwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/80918877851.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lurexemip.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a81.bin
4c2735a3ba2df7c948647f9d3038f0138ed92b291530585e130489c9f60bdd8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A81 5296 bytes
font_01_sfnt_off0000ac6d.bin
f9ff7de6dfc7a21f99a4076426decea526eea0d8c96f17499993cf0c38d0ccbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6D 10228 bytes

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