Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cffd7232090ff6b…

MALICIOUS

PDF

41.1 KB Created: 2020-08-08 00:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37e9f26ea2284385ef558f4e2d23cf09 SHA-1: 7e70fe9f1edb80be5d3d45e000b8c18d5424f668 SHA-256: 5cffd7232090ff6b2da143ac0f4ecee1a8ec0e239dbbbf6c44ef3feef3a54c71
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many of which point to what appears to be a link farm designed to host other PDFs. One prominent link, disguised as an 'Arduino starter manual pdf', redirects through 'ttraff.ru', a known malicious redirector. This suggests the document is part of a phishing or scam campaign aiming to direct users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=arduino+starter+manual+pdf
    • http://bixox.carriagehousepilatesandwellness.com/uploads/1/3/1/3/131383791/aaaa9a31.pdf
    • http://files.josezayasdirector.com/uploads/1/3/2/7/132712120/3529890.pdf
    • http://files.redbackbjj.com.au/uploads/1/3/2/6/132682787/d1611729a76a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5730/7039/files/cemu_games_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77330784460.pdf
    • https://cdn.shopify.com/s/files/1/0429/1995/2550/files/jizuve.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2054/files/tabs_open_alpha.pdf
    • https://cdn.shopify.com/s/files/1/0432/6457/3593/files/zedijuxobofuzebefexube.pdf
    • https://cdn.shopify.com/s/files/1/0437/6333/5319/files/xemuropizar.pdf
    • https://cdn.shopify.com/s/files/1/0431/5335/9005/files/zelefarosaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/bewibirijovitajali.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdf
    • https://cdn.shopify.com/s/files/1/0432/8541/4056/files/atmel_atmega32_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/1172/6750/files/rojagupazulavusew.pdf
    • https://cdn.shopify.com/s/files/1/0438/4735/2480/files/lujatiresozanaferiwegado.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006104.bin
f72436facadf13f3281b52160f10c8f1e974ee7472edd4782b09f9024bf32304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6104 5176 bytes
font_01_sfnt_off0000728b.bin
9a15d311ec3a93a1b4e3373a741be1ff7deba6bbe3a5649e8c6842c8a9058710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728B 10480 bytes

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