Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4378c5e155c6e43…

MALICIOUS

PDF

59.3 KB Created: 2020-08-01 13:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef561b6c79b454551ccca5f4fa8648bc SHA-1: cdf84da799596bae41cab8ddb3b93ca5be9d0c21 SHA-256: a4378c5e155c6e43194a73397a8f53b90ab1b0db413df6d68d91862652ce3b6e
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic indicates that these links point to a known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the same redirector URL and a benign-looking Shopify URL, suggesting a link farm designed to distribute malicious content. The primary attack pattern involves leveraging these links to redirect users to potentially harmful sites.

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=shaymin+sky+form
    • http://files.columbiadentcenter.com/uploads/1/3/0/9/130969910/jubegonakajij-desagomabof-sateno-pikilolot.pdf
    • http://files.dartmouthregatta.co.uk/uploads/1/3/0/7/130740323/visilumijirujadudimu.pdf
    • http://files.sophiebehal.com/uploads/1/3/2/3/132303082/f85b8f922.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1480/files/17558426053.pdf
    • https://cdn.shopify.com/s/files/1/0435/3690/8439/files/nidumesikuvavidebuxeto.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9887/files/71249732175.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/77850978280.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/82914276078.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41326774972.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/xumorirelilalipigudumikux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gatafuruzakelimosileraji.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/goluvugivojifugotumorope.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4238/files/45596148385.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/
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/xumorirelilalipigudumiku

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000749c.bin
3c17cad5c63ea98fda4267390cf0b0d8883ae59d70b07c1a3f9f391ae70f0a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749C 9260 bytes
font_01_sfnt_off00009397.bin
9d59e8cc2bdcab05ed3a25562ea3148bac701ee8162f8c43e403b2acb84b5e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9397 5244 bytes
font_02_sfnt_off0000a544.bin
6360afdd49c75574e18d160ac6b41489919da7544bdf145f9840c41edf41bca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA544 7656 bytes
font_03_sfnt_off0000ba14.bin
e7dfc6b22403cc41047f21d382f34aadfff83d60da8aefdf5d6046b87a3d2382		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA14 10468 bytes

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