Malicious PDF — malware analysis report

Static analysis result for SHA-256 8562d997005982b1…

MALICIOUS

PDF

49.4 KB Created: 2020-09-05 03:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 953cabf5cdfc1aa98c08b64cf431e849 SHA-1: 490649c124c55956c4e3bc91c8f1c54b92e09d81 SHA-256: 8562d997005982b1f38c971e8053b64e8c88cdeb93b61157ef7d713a8c5fbd20
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL points to an attempt to lead the user to harmful content.

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.me/wix?keyword=lagu+alodya+desi+pacar+sabtu+minggu
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_96eedea859fb4cba9c5132bc38469d66.pdf
    • https://static.usrfiles.com/ugd/8a419d_2c62ba87f146408381292800696d870d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2ea90ecca954ddb8538d840114365d5.pdf
    • https://static.usrfiles.com/ugd/bd1fc0_d7aae38b50f74e728a63269bd0c91c93.pdf
    • https://static.usrfiles.com/ugd/bf07b1_17e75fab2ffa4b2a9bebf119a666ca89.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/biopsychosocial_case_formulation.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/punnett_square_incomplete_dominance_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0736/files/gepadab.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/58193251103.pdf
    • https://cdn.shopify.com/s/files/1/0431/9464/6689/files/vegotojatad.pdf
    • https://cdn.shopify.com/s/files/1/0428/7388/0739/files/51345316575.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/dinitokabuge.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2774/files/83982494489.pdf
    • https://static.usrfiles.com/ugd/4d935e_677f3cbc179b46439e92f09dbf7af07e.pdf
    • https://static.usrfiles.com/ugd/5a1791_0cc8bd1bcf6f4bb8ad1beb35f0026673.pdf
    • https://static.usrfiles.com/ugd/694d5d_2677824112a345bcb52f284b2ff1cf2f.pdf
    • https://static.usrfiles.com/ugd/4dded2_f8c388db764c4ad79ef7197869d9ce03.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_off00007351.bin
2c541651bcf51130beb1fde008196a4ccc3dbc353ddba1586175137c31102d88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7351 5460 bytes
font_01_sfnt_off000085cb.bin
f54cda60cdcfb9f2ff5ce66b158e98ac43d73790d637ec3c13aea58d97944eb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85CB 10700 bytes
font_02_sfnt_off0000a9bf.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9BF 4324 bytes

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