Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c4dd4a24fbabb3…

MALICIOUS

PDF

67.0 KB Created: 2020-08-19 07:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed7780cc5bf9b0a7f3fee488e33e03dc SHA-1: 8cc566595d20e336fe47eddc54afa066974a7c37 SHA-256: 96c4dd4a24fbabb3752f415adf6e15167872c5a063f3915c6cf18b8d3156ded5
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=dreamville+rotd+3+album'. Additionally, it exhibits a PDF link farm heuristic, with numerous links, including one to 'https://cdn.shopify.com/s/files/1/0431/4683/8176/files/resignation_letter_sample_doc.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting the primary intent is to redirect the user to malicious infrastructure.

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=dreamville+rotd+3+album
    • http://files.divewithsteve.com/uploads/1/3/0/7/130740191/d76a07e2fee.pdf
    • http://pulakij.bunnybakery.co/uploads/1/3/0/8/130813669/b7febd01d5.pdf
    • http://files.jcardinahl.com/uploads/1/3/1/6/131637131/kapuremibokid_korakenavodof_nedadumuw_zamire.pdf
    • http://files.udmuas.com/uploads/1/3/1/3/131379740/javaduwavusibepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4683/8176/files/resignation_letter_sample_doc.pdf
    • https://cdn.shopify.com/s/files/1/0434/5669/2390/files/instagram_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0441/1057/7816/files/17680781897.pdf
    • https://cdn.shopify.com/s/files/1/0434/0108/5082/files/59891043623.pdf
    • https://cdn.shopify.com/s/files/1/0429/7470/7868/files/pitumakekukopu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/73881014095.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78108387577.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/26754203303.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9718/files/reactor_incremental_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/fevajakozabakorux.pdf
    • https://cdn.shopify.com/s/files/1/0429/5252/3929/files/99984142576.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_off0000c858.bin
a9630b09c305c870160d72da14f5338c958d9b9872476539b59887b7f6385fb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 5156 bytes
font_01_sfnt_off0000d9d2.bin
bea7e51f15ec8dbff018273cd3618cb052e602f41b99f59d96600ed658fcc2d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 10856 bytes