Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d5accfefb42ea5…

MALICIOUS

PDF

44.8 KB Created: 2020-08-22 01:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c974b8bb24af611e52e7ff00386cf734 SHA-1: 2bf039981f2b9b7e3e5b3ff016c5d6bc1be1da1a SHA-256: c1d5accfefb42ea503d9fdcb6fd95dcd35f9a5be1b759f4ea82eb093e0dfb068
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains references to a worksheet and includes the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility and lure victims. No scripts were extracted, but the PDF structure and embedded malicious URL are strong indicators of a phishing or redirection attack.

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=coordinate+geometry+triangles+worksheet
    • http://files.erniefelice.com/uploads/1/3/1/6/131637218/c5cabe9e707fa5.pdf
    • http://sipudaneg.jhmartist.com/uploads/1/3/0/8/130874493/dd8fec6bd.pdf
    • https://cdn.shopify.com/s/files/1/0430/2284/4067/files/focus_on_life_science.pdf
    • https://cdn.shopify.com/s/files/1/0429/9148/5091/files/wedding_reception_invitation_wording_templates.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1152/files/anaganaga_song_from_aravinda_sametha.pdf
    • https://cdn.shopify.com/s/files/1/0437/2257/1930/files/89567918847.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/tuzesari.pdf
    • https://cdn.shopify.com/s/files/1/0431/4257/8332/files/sharah_qasida_burda.pdf
    • https://cdn.shopify.com/s/files/1/0438/3480/2333/files/80286432280.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/prime_numbers_1_to_100.pdf
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/kaxeretisanuzodotaxoduve.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/morodof.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/gezibedupaf.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_off00005b5a.bin
c21f8fc9be5f391e4977d62acf437ee6a9e8783e430c64bd78ddbefc9141a218		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5A 5404 bytes
font_01_sfnt_off00006da6.bin
af2bf2fc26d1019431bf5465a461c34cd795810d96103ee97a43125298c62f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA6 10180 bytes
font_02_sfnt_off000090ba.bin
0ed8b93b32fb81aa9a8a31fd255b961150b4326bb94ce8f2854b014d12a27ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90BA 16248 bytes

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