Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b22b8540746b34b…

MALICIOUS

PDF

51.9 KB Created: 2020-08-06 20:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 323412021ab009c627d20a984dec56bc SHA-1: a5ff2cada01014b1cbb1ce66043cbfc5451483c7 SHA-256: 6b22b8540746b34b542891e462c3296abcef557d60415708c8c479c03da06a12
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, many of which point to a link farm designed to distribute malicious content. One prominent link redirects through `ttraff.cc`, a known malicious redirector, to a PDF file. The document body, though heavily obfuscated, contains the text 'English speaking skills books pdf' and the malicious URL, suggesting a lure to trick users into clicking the 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/pify?keyword=english+speaking+skills+books+pdf
    • http://files.cparg.ca/uploads/1/3/1/4/131438464/1505426.pdf
    • http://files.bodykarmadenver.com/uploads/1/3/2/6/132680813/b6f44e2bd1.pdf
    • http://files.rollingthunderky5.org/uploads/1/3/0/8/130813054/tajovadejupusiz.pdf
    • http://files.zaiaboutique.com/uploads/1/3/0/8/130813694/863a310808.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2025/4375/files/dirofitum.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/sizatiwejeverixo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2102/3904/files/aprender_gramatica_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/causes_of_the_american_revolution.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/vologagekiluli.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/62454611738.pdf
    • https://cdn.shopify.com/s/files/1/0428/5385/9494/files/wukong_jg_s6.pdf
    • https://cdn.shopify.com/s/files/1/0450/2405/1358/files/rope_rescue_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/xalomasi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/40316814178.pdf
    • https://cdn.shopify.com/s/files/1/0434/9575/1842/files/62004300942.pdf
    • https://cdn.shopify.com/s/files/1/0435/3051/8682/files/safasoxirikiko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008016.bin
53bd268c54c2036c1a143fce6a8df19aa9a810404e6f8cb4f9788048fd0e2a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8016 5368 bytes
font_01_sfnt_off00009252.bin
be2e3595ff4efc4ae89d0d533636aeb5852c9803a6a4740b0821b40a29a9485d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9252 3484 bytes
font_02_sfnt_off00009fa1.bin
c52dea131587cbac0ddecb8d30e90dab4b3f4ba1ea5c799793a4dcc32dbc0019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA1 10212 bytes

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