Malicious PDF — malware analysis report

Static analysis result for SHA-256 257a439ab5aaf8bc…

MALICIOUS

PDF

43.8 KB Created: 2020-08-29 08:39:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14482e4ecb689000b2da33ca28b901d6 SHA-1: bf2e395230ab7be1fd728d367c7b36f396162bbc SHA-256: 257a439ab5aaf8bcde0fa430eb20eceaebc62902100b28a7f2c7a0f60834dc10
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics as a malicious redirector and a link farm. The primary malicious URL, https://ttraff.com/wix?keyword=..., is a known redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on cdn.shopify.com, many of which are classified as confirmed benign, suggesting a tactic to blend malicious links with benign ones. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=%25D0%25B2%25D0%25BE%25D0%25B9%25D0%25BD%25D1%258B+%25D0%25B4%25D1%2580%25D0%25B5%25D0%25B2%25D0%25BD%25D0%25BE%25D1%2581%25D1%2582%25D0%25B8+%25D1%2581%25D0%25BF%25D0%25B0%25D1%2580%25D1%2582%25D0%25B0+%25D1%2582%25D1%2580%25D0%25B5%25D0%25B9%25D0%25BD%25D0%25B5%25D1%2580
    • https://cdn.shopify.com/s/files/1/0432/6840/7464/files/adverb_of_frequency_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/7991/6967/files/makalah_asbabun_nuzul.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/vuferisuzirupol.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1685/files/hallelujah_sheet_music_violin_and_piano.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/xewukafeluwamu.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd0d0913464c447e8d33514485477726.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bc711463b5543f9bfda39dff8fea57d.pdf
    • https://cdn.shopify.com/s/files/1/0433/7552/6042/files/91346324657.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/komon.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6726/files/statistical_methods_for_the_social_sciences_agresti.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5542/files/what_are_10_examples_of_compound_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0431/4634/6657/files/general_ledger_accounting.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_off00005152.bin
bd66b75cfa62a56636eee3e1bba84d3f2a462733666a50b6fe688aadc268a2f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5152 4904 bytes
font_01_sfnt_off000061e2.bin
40dd3f4da2aae435cdf49dac31a6eaa52fbd93868e5564cf239ad039eec17ef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E2 15408 bytes
font_02_sfnt_off000091a9.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91A9 4324 bytes

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