Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d79297d4d6d7397…

MALICIOUS

PDF

43.5 KB Created: 2020-08-31 23:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f67e129173ba3fa368e181adfd3cad0 SHA-1: fc34cf50e3d50687a434d69036219fc540311b81 SHA-256: 0d79297d4d6d7397c7a2f1b4c756fe41e831efd4ce39a8bf6b59b17ba638a2c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/wix?keyword=college+board+sat+practice+test+1+answer, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'College board sat practice test 1 answer', suggesting a lure to trick users into clicking the malicious link. 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.cc/wix?keyword=college+board+sat+practice+test+1+answer
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0464/5178/5896/files/7351170315.pdf
    • https://cdn.shopify.com/s/files/1/0432/9927/4916/files/42782374769.pdf
    • https://cdn.shopify.com/s/files/1/0430/5371/1513/files/convertir_archivo_de_a_word_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/puvaposeruximovibejazedin.pdf
    • https://cdn.shopify.com/s/files/1/0440/7099/4085/files/61742132603.pdf
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/tisatuweg.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/ditekubaxiroribolo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9911/1070/files/bioethics_topics.pdf
    • https://cdn.shopify.com/s/files/1/0435/6685/8408/files/tufowosa.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/tamumorakudiz.pdf
    • https://cdn.shopify.com/s/files/1/0441/3105/7816/files/zufizilemokalifuluzi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3191/2857/files/20418714117.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/puranuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/6138/6147/files/dream_league_soccer_2018_download_fo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6362/2297/files/dave_lombardo_music_groups.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a86.bin
03b57b6e86cb2a7670fda62a1b17d2f055d7dcc3e3bb48c4b479efb429bf0c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A86 5432 bytes
font_01_sfnt_off00007d18.bin
59785d7ca3f56c86b21e2db9df81a941936917aaa9a3608e1e38478f17e910da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D18 10616 bytes

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