Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e21e783388b275…

MALICIOUS

PDF

63.9 KB Created: 2020-08-29 03:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0702da92fe3da90ae9c20eb62c7b8f8f SHA-1: 6c7c1736b25707ff174df4400b10a7d16fae2a2c SHA-256: 71e21e783388b275d9fc3ad5ffca3debd679e5403c6e022398b9311568790ba3
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the redirector link, suggesting a lure to a malicious site. 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=fire+emblem+heroes+weapon+refinery+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_4f47f62f9f354b58b6213d2f9cf468d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9094cecce29413e8dbf969416a669a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d9bee09b579481d9e3146f0052d6d1c.pdf
    • https://cdn.shopify.com/s/files/1/0432/6244/3675/files/gta_v_solo_hangar_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/binary_subtraction_using_1_s_and_2_s_complement.pdf
    • https://cdn.shopify.com/s/files/1/0462/0268/3545/files/doramigemenegib.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/reliability_analysis_book.pdf
    • https://cdn.shopify.com/s/files/1/0459/7006/3520/files/vokonod.pdf
    • https://cdn.shopify.com/s/files/1/0438/5662/5829/files/36730960483.pdf
    • https://cdn.shopify.com/s/files/1/0465/3269/0070/files/nolalatelevive.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6421/files/lubikiguwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0246/1351/files/the_talented_mr_ripley_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9544/files/shinee_concert_hd.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/america_the_story_of_us_cities_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0437/1657/5383/files/xasizet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e1a.bin
5e6de736679abe64bf57f05b5c3d3cb911b04090b2f7cb9279f3100c33751114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1A 4780 bytes
font_01_sfnt_off0000ae7c.bin
31afe81116543166e465b9e9065e4902b62c2b6a8512590260286d93340f03e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7C 5544 bytes
font_02_sfnt_off0000c12f.bin
6b757a086f40621a74f31e1eff8ed6629b3a8e43ef07194d33cbf9f31bda6be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC12F 10112 bytes
font_03_sfnt_off0000e3cd.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 4324 bytes

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