Malicious PDF — malware analysis report

Static analysis result for SHA-256 b115ffc61507e019…

MALICIOUS

PDF

40.7 KB Created: 2020-09-18 05:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8c7f7db129ce01ecd4cba75982e97f9 SHA-1: 36c550346cade18f8309c28b32198b48114a7fb4 SHA-256: b115ffc61507e019e792920f03cec81f1a1563e0406e6e6146f7a3f6efa26711
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files, characteristic of a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to 'solving polynomial equations worksheet', intended to trick users into clicking the malicious links.

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.link/wix?keyword=solving+polynomial+equations+worksheet
    • http://files.deborahlane.org/uploads/1/3/0/8/130814706/kawip.pdf
    • http://files.pama.org/uploads/1/3/1/4/131406258/rusopinafofagapud.pdf
    • http://pexuxiw.redeemerwestfield.com/uploads/1/3/1/0/131070291/nokupuxobuja-vuxarud.pdf
    • http://files.knowledgeutopia.com/uploads/1/3/1/4/131453725/d6177d4.pdf
    • http://files.windowtothewild.org/uploads/1/3/0/7/130738841/zutozerebedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/mipuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/vitamin_b12_deficiency_anemia.pdf
    • https://cdn.shopify.com/s/files/1/0431/1046/5698/files/63621606562.pdf
    • https://cdn.shopify.com/s/files/1/0479/6501/2135/files/rca_windows_10_tablet_charger.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3533/files/themes_app_for_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2277/files/che_guevara_quotes_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3851/files/adda247_reasoning_book_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0436/9969/9866/files/89817054564.pdf
    • https://f6c330c7-b79d-4ef5-9543-37dc19814786.filesusr.com/ugd/217b8a_0cc269e988434e7da8ea7baa2dc3fdcb.pdf?index=true
    • https://26f31cb7-ee0e-4e08-a0e6-aab6b32608a0.filesusr.com/ugd/0aab01_b559936b388c4298a9538c5bb8edf231.pdf?index=true
    • https://9634db1d-79c9-4261-8ee7-8fadbe8ba5f2.filesusr.com/ugd/5e8de6_8c4e6021949e45e3a4c1deaf9a46ff88.pdf?index=true
    • https://7506d60d-6861-4a97-b74a-53df23f2bf42.filesusr.com/ugd/3eb4bd_e24969044667485ebbd26fa1139f025e.pdf?index=true
    • https://978a079d-7eb4-4ba3-9693-d7c8d1733956.filesusr.com/ugd/d2cc1f_26d5061d65f74c9b9d2e467d5e728540.pdf?index=true
    • 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/
    • https://cdn.shopify.com/s/files/1/0431/1

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe0.bin
7aee1106370893c00e0c744e6e09355bafa055f82630e39820f98c7e75a66a64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE0 5780 bytes
font_01_sfnt_off0000737f.bin
dcf2f59d62aa327b9f6122b0b63d5a82bd208c36b03e3a43cf30425ac8a01746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737F 9876 bytes

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