Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cb3985669fef2b…

MALICIOUS

PDF

53.2 KB Created: 2020-08-30 09:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c89aa2444fef8dd77cc1ba303b6fcec6 SHA-1: 55c8b0bf421c903f876e3e4fe842a5811091884f SHA-256: a3cb3985669fef2b0ecf59bbdab245a2c8809ef1e50a6dcd61bdb3a2dd67d727
152 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 'ttraff.me'. Additionally, it exhibits a PDF link farm heuristic, embedding numerous external links, with the primary one leading to a Shopify domain. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirector URL, suggesting the primary intent is to redirect the user to malicious infrastructure.

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.me/wix?keyword=seacat+cottage+brixham
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/clinical_chemistry_tests.pdf
    • https://cdn.shopify.com/s/files/1/0438/4922/0256/files/business_report_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/7230/5817/files/dijuzunijuviminanu.pdf
    • https://cdn.shopify.com/s/files/1/0447/2127/5033/files/oxford_english_dictionary_ebook_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/simewurazerigigetuvexata.pdf
    • https://static.usrfiles.com/ugd/be19e1_d4bdfe9ff82343dd89ddd764052d1121.pdf
    • https://static.usrfiles.com/ugd/8b49c6_b6e1c96e3a6549d09400d031dd90db4a.pdf
    • https://static.usrfiles.com/ugd/38bf1f_dbfa1c2b69924079b209989d7feacddf.pdf
    • https://static.usrfiles.com/ugd/cafc24_8aab6af54ccf430ca1d16ef2650c36a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c00e3fd763d49aeb52b56d4275fa331.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/84792077740.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/82504026289.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nozawilod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58585016777.pdf
    • https://cdn.shopify.com/s/files/1/0432/2299/1007/files/boy_scouts_wolf_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/98987336793.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/tobib.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/1/0438/4922/0256/files/bu

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000093fe.bin
bf87c5e7c97b760e3cc7bb75c97150146148a6a69993dbeace4dcbd119745a66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93FE 5316 bytes
font_01_sfnt_off0000a5ea.bin
e13a59839eda187cd01ecc0c6434d62d1e4939550d5306cf85a3ea9611ad80c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5EA 9816 bytes

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