Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca357c9e6a46101…

MALICIOUS

PDF

44.1 KB Created: 2020-08-09 04:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c88e8530f673012c225bf1625a2feda SHA-1: 89d09e4ee7ade510b53f09a76225fc549e63e42c SHA-256: 9ca357c9e6a46101b223d2a6e34f56761dc31be0c838f237670d40cf950b569b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to Shopify-hosted PDFs, many of which are likely generated for SEO purposes. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=algebra+sample+questions+pdf', reinforcing the lure of sample questions to entice clicks.

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=algebra+sample+questions+pdf
    • http://files.daniellerobidoux.com/uploads/1/3/0/8/130874324/ac5cd533.pdf
    • http://files.luisimera.com/uploads/1/3/1/4/131438718/6695462.pdf
    • http://files.walcotchurch.co.uk/uploads/1/3/0/8/130874359/a65ffb2b0aa1e.pdf
    • http://ramovawox.shadowoodgolfshop.com/uploads/1/3/1/3/131381518/6164981.pdf
    • http://jenugag.cynthiahovdaphoto.com/uploads/1/3/0/9/130969744/900832d7.pdf
    • https://cdn.shopify.com/s/files/1/0437/4626/3201/files/jakukasapuzaziwuri.pdf
    • https://cdn.shopify.com/s/files/1/0434/5085/9670/files/bengali_recipe_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/stockholm_airport_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/8449/7575/files/definition_of_representative_democracy.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/84301592281.pdf
    • https://cdn.shopify.com/s/files/1/0433/3980/8922/files/bujofimilonimokejamej.pdf
    • https://cdn.shopify.com/s/files/1/0429/4914/8828/files/razezepakokakam.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/zasisulotatujafijefekumeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/7876/9045/files/werisemimire.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/takepus.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/3619118904.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/31531003166.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/zibujesifatudiregilukera.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/92562467763.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_off00006bc8.bin
98b6d14a8803cd3b2036fd36000ad4748e670414fdf9e4eddff8e73998e23357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC8 5616 bytes
font_01_sfnt_off00007ebb.bin
32e03071bb9cfa2ec865bb155f922dc15eb9c5356159da32e772165bbad6854e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBB 10928 bytes

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