Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d139ece678eb678…

MALICIOUS

PDF

43.7 KB Created: 2020-08-12 21:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bdef037b8ce3945aa00cd0655c15161 SHA-1: e4ca4d06f4963c0d017214b119ac65dff59b6ba3 SHA-256: 6d139ece678eb678c14c5d15b85a8f4d78f75f620d565a087bd4b82377732bb2
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with a significant portion pointing to a redirector service known for malicious activity. The document body, though heavily obfuscated, includes the URL 'https://ttraff.ru/pify?keyword=adding+proper+fractions+worksheet+pdf', suggesting a lure to a malicious site disguised as educational content. 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.ru/pify?keyword=adding+proper+fractions+worksheet+pdf
    • http://files.scharencycles.com/uploads/1/3/0/7/130776118/ginukaxezunat.pdf
    • http://files.expwny.com/uploads/1/3/1/4/131437276/suwov-lebebixudekizan.pdf
    • http://files.mistyhollowlabs.com/uploads/1/3/1/4/131453329/kirexubapi_nupujiroxepe_jumabijexaduk.pdf
    • http://files.edmparging.ca/uploads/1/3/1/4/131408241/zagisezi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/rozujuzepake.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/kagizozimile.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/the_secrets_of_practical_kabbalah_itzhak_mizrahi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mujunevuduw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9236/1887/files/68920033515.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0469/files/windows_7_where_is_hosts_file.pdf
    • https://cdn.shopify.com/s/files/1/0437/1608/3877/files/juvepoxelabefovemugijisu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/jawudosolajimimujelalumik.pdf
    • https://cdn.shopify.com/s/files/1/0440/7037/1493/files/25262702066.pdf
    • https://cdn.shopify.com/s/files/1/0437/3214/0186/files/85099570592.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/85388189912.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/woluperazerufiti.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_off00006d6a.bin
0b085d813fc7dd55ed3f972c9574cfdf229a519733bc87d7b0138bd5bfbe365b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6A 5528 bytes
font_01_sfnt_off00008041.bin
58eccde77cb158c85371fb43cb0ad9cf2102de709a5e689f08a806f29eedaec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8041 9836 bytes

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