Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc031606f7648e58…

MALICIOUS

PDF

66.0 KB Created: 2020-08-09 10:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c5c16cc3f5014e91500bc49b3290cde SHA-1: 3afa8e4b11a5a44213b5934244d7280a60443f79 SHA-256: cc031606f7648e583b917ce069ec45a3594d7d37072f5b625a73dd0ffa40d6dc
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=squeezed+states+pdf'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain the malicious URL and several other links, suggesting a lure to external 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=squeezed+states+pdf
    • http://files.taurangacivicchoir.org.nz/uploads/1/3/1/3/131380292/eb77b75a.pdf
    • http://vafosen.kellyclinton.com/uploads/1/3/2/6/132681513/9157281.pdf
    • http://files.campconcordia.net/uploads/1/3/0/8/130874122/xigoja.pdf
    • https://cdn.shopify.com/s/files/1/0440/5130/0517/files/jorge_luis_borges_short_stories.pdf
    • https://cdn.shopify.com/s/files/1/0432/4671/5040/files/bolizenutovapawufitokeza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/memew.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8741/files/how_to_edit_hosts_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/8506/1541/files/jubinezodipilegati.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/25598471077.pdf
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/57758134343.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/download_vimeo_videos.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/88990434427.pdf
    • https://cdn.shopify.com/s/files/1/0431/5470/2496/files/61336157056.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5669/files/38801122562.pdf
    • https://cdn.shopify.com/s/files/1/0434/6380/3040/files/autobiography_sample.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a283.bin
f722090cff7bfabc44603e66f9792f13864e87a9891b854da4f641abb1b3dd24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA283 5184 bytes
font_01_sfnt_off0000b446.bin
ab85337a23170bb30ee692c363ac845851aac0da685705d1fec64a4b29f8f813		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB446 15436 bytes
font_02_sfnt_off0000e5aa.bin
288b138df9431e937bec2a95707a4223505badfdf245fcec1d31834ee423992a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 16236 bytes

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