Malicious PDF — malware analysis report

Static analysis result for SHA-256 675a1b68419ddd1f…

MALICIOUS

PDF

49.7 KB Created: 2020-08-31 12:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5c6b42e1efe0fb6731445010f505b41 SHA-1: a1efa602a1103f36daf2968d9b10895fab826855 SHA-256: 675a1b68419ddd1fb435ee3f17f9a8cd60b833ff4c16ca16abd5a89527bfbf5e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Fulbright fellowship interview questions' to entice users to click the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=fulbright+fellowship+interview+questions
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/4ae4db_dc945496563e411494213352ee160e6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_441e3a808b99455dab9bd83af84f3a4f.pdf
    • https://static.usrfiles.com/ugd/a43ec6_cd12bfd4085e43b6a6c6ac2db7d05d0d.pdf
    • https://static.usrfiles.com/ugd/9cc572_684907d7ea784260b47e22b471bd954f.pdf
    • https://static.usrfiles.com/ugd/b8c837_436d222b5ad2406e8b732ce8670b9841.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dewefezagabujam.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/navupugasanujuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/1173/3664/files/gavetixujojuzufibabonaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/56696633082.pdf
    • https://static.usrfiles.com/ugd/c12414_67cb31fe06dc485ab5eb3556dce231cf.pdf
    • https://static.usrfiles.com/ugd/02beb7_0e01e612660f41eba716e17bbddfdbce.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc5f17f1c9a64ac3bf44c0439541038a.pdf
    • https://cdn.shopify.com/s/files/1/0439/0718/6843/files/pilaxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2903/files/the_book_of_awakening_mark_nepo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8958/3514/files/characteristics_of_islamic_culture_a.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_off00007642.bin
28804430611e2b9c63b37ee93dc08b02523e1f56605e82c34f629e13f29a3a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7642 5208 bytes
font_01_sfnt_off00008804.bin
24c1df571e4b3119919985d80410fea7f54527e94cc31b23f3fc731580e9c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8804 10300 bytes
font_02_sfnt_off0000aaeb.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAEB 4324 bytes

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