Malicious PDF — malware analysis report

Static analysis result for SHA-256 09506d6d84b84359…

MALICIOUS

PDF

47.3 KB Created: 2020-08-13 05:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28fb2d5129c09a5251ff68ffbf447abd SHA-1: 91f061db1273a96f74376be0ea2d2c15c429f359 SHA-256: 09506d6d84b8435939861f6492877eca85ed5a35e66d4e02f5f786d4a1bd1cf1
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'ttraff.ru'. The document body, though partially corrupted, includes text related to 'understanding business law' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=understanding%20business%20law%209th%20edition%20pdf
    • http://files.jbirdmultisportcoaching.com/uploads/1/3/0/7/130740625/valof.pdf
    • http://files.adamwilliamchalmers.com/uploads/1/3/2/8/132815791/vilujegol.pdf
    • http://rogug.feministlibrarian.co/uploads/1/3/0/7/130776680/lesikikoburufisufopa.pdf
    • http://rilejiluw.honeypotcreativecafe.com/uploads/1/3/1/3/131398368/3b051e011c0.pdf
    • http://files.oilfieldfrclothing.com/uploads/1/3/1/3/131383629/talepodesafamixa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3799/0813/files/60501818785.pdf
    • https://cdn.shopify.com/s/files/1/0438/4587/7922/files/adaptive_learning_technology.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/32686550022.pdf
    • https://cdn.shopify.com/s/files/1/0437/9826/6016/files/1972_cutlass_supreme.pdf
    • https://cdn.shopify.com/s/files/1/0435/7786/8443/files/baduw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2809/4882/files/nazawafita.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/mujivovaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/0517/4179/files/buwejobexemi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9286/0327/files/phonics_lesson_plans_for_1st_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/ditibiludukum.pdf
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/buwemovagapix.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6412/files/noxumubukapazuzumugepa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/super_mario_bros_3_online.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_off0000745e.bin
cc265654f21c19f7ec82a58f9483c23614bca2434b63236ad0863579e868d35b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x745E 5684 bytes
font_01_sfnt_off000087b0.bin
d48868461e0cbce77659c6ae65669bef34e522442afc5a5e995dd1d262156954		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87B0 12772 bytes

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