Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc158649dec19e92…

MALICIOUS

PDF

37.9 KB Created: 2020-08-16 11:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20a30ae80f15c6c6e7f28ae6c53cbbc0 SHA-1: 7e1bdf9fa66fa49e6bff371afb670da4af19efc2 SHA-256: cc158649dec19e927a2a198413e018195ce47b0f7a97e2f566259de1b03b7bae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One of these links, 'https://ttraff.ru/pify?keyword=android+studio+online+test', points to a known malicious redirector. The document appears to be a link farm designed to lure users to potentially harmful sites, likely for phishing or malware distribution.

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.ru/pify?keyword=android+studio+online+test
    • http://files.texashollandlops.com/uploads/1/3/1/3/131379371/7953459.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/79776774989.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/lipid_metabolism_file.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7189/files/58914604957.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6774/files/free_xbox_one_game_codes.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/dakegapulob.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/thinking_out_loud_lyrics_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6354/9845/files/kuwapojevagunigusanixalip.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/tosof.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_off00005959.bin
34eb613083066c9e2185189c6ec3f4aa5574cfb852b6b9af5126a40dc2dec281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5959 4600 bytes
font_01_sfnt_off00006902.bin
0ae9ceba18b11296189bf63cfdc1d197e7a702b83f786e39ef1755a2c01271f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6902 10096 bytes

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