Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7177f0945deb4a5…

MALICIOUS

PDF

45.6 KB Created: 2020-08-12 12:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b166c946061d5e8207d0e8f44106e74 SHA-1: 07785451d23eaabf85d0c161049259c62a862252 SHA-256: f7177f0945deb4a56b7c293f44b66bf685cc03e94416967ed480672a0cbe3fbc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though partially corrupted, includes the same URL and references educational content, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm SEO strategy to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=adding+and+subtracting+fractions+worksheets+pdf+grade+7
    • http://files.gildafk9.com/uploads/1/3/2/7/132712266/c66c530a1b355.pdf
    • http://files.beavercreekbaptistchurch.com/uploads/1/3/1/3/131398358/finup.pdf
    • http://nanesa.drlindaford.com.au/uploads/1/3/0/8/130874493/8965338.pdf
    • http://files.pallensmartialarts.com/uploads/1/3/0/7/130775116/wunisudik_bawunuremugox_fisorazenamizuk_sufibed.pdf
    • https://cdn.shopify.com/s/files/1/0437/3384/4119/files/52386449663.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5674/files/accounting_rate_of_return.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/fonavililapaza.pdf
    • https://cdn.shopify.com/s/files/1/0439/5764/9566/files/modejikab.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6723/files/calligraphy_fonts_a_to_z_capital_letters.pdf
    • https://cdn.shopify.com/s/files/1/0434/3208/3612/files/74179452615.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/97868452230.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/convert_scanned_to_word_file_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/27947977816.pdf
    • https://cdn.shopify.com/s/files/1/0435/1324/9944/files/zoo_animals_coloring.pdf
    • https://cdn.shopify.com/s/files/1/0433/9597/3276/files/nosez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/magobusiriwolozun.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/43653470816.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007316.bin
0fa355271f41b8bf234eab3a56bb40c76fc56db186042c5e082b311f0dc7dc99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7316 5748 bytes
font_01_sfnt_off000086b2.bin
18107d0a33d8fe5b0f4a60f106419f5bccae4e891aee859f05fe87006fea1df6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B2 9836 bytes

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