Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b9aba71f5453d8…

MALICIOUS

PDF

73.4 KB Created: 2020-08-10 12:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 223df9149c738b3fe896bae9b24d199f SHA-1: 4cea8fb3f09bcc8ab8f506cc33fb9235cc625f7f SHA-256: 29b9aba71f5453d8b1a8df7028e704be1b2489b8b05517590d7008ceab7c0c95
154 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, pointing to 'https://ttraff.cc/pify?keyword=assumption+of+cardinal+utility+pdf'. Additionally, it features a mass external PDF link farm, with the first URL being 'https://cdn.shopify.com/s/files/1/0431/9484/3298/files/lujekeborokivod.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting a social engineering lure to a malicious site.

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=assumption+of+cardinal+utility+pdf
    • http://files.mykelpie.cz/uploads/1/3/2/6/132695302/bulibu.pdf
    • http://duluxowos.ocon.ie/uploads/1/3/0/9/130969332/363185fd2f50b.pdf
    • http://files.maxwellsbattery.org/uploads/1/3/0/7/130776511/61aac.pdf
    • http://files.artfulflowe.com/uploads/1/3/0/9/130969489/zepiminipobizoxado.pdf
    • http://files.pft1881.org/uploads/1/3/2/8/132815123/fasoxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9484/3298/files/lujekeborokivod.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9058/files/80999335289.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2515/files/modern_art_history_timeline.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/propellerhead_recycle_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/46491355860.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/18297732637.pdf
    • https://cdn.shopify.com/s/files/1/0436/4229/0336/files/68850897868.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8620/files/92929359860.pdf
    • https://cdn.shopify.com/s/files/1/0440/9432/4888/files/namuladitumakobakovij.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/padakuxavowiwapepuwaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2213/9041/files/tesokugazotusepazonitim.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1077/files/37436023890.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_off0000dbbb.bin
a9aeee6987dd8ef399b16a7bf36b825d076c45c1287c828575042a62def95fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 5392 bytes
font_01_sfnt_off0000ee04.bin
1a9d04a5ee358c44da84ffc5105d8d9de3dc6c713097a6e448093cbd4f9c4ef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 13300 bytes

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