Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a04a71bd4dfe52…

MALICIOUS

PDF

49.6 KB Created: 2020-09-06 10:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b0e45141c20161ada222a9c6509107a SHA-1: 18d2351510d8547dc7e2a6da3aec0faa5645d595 SHA-256: 02a04a71bd4dfe52f5c238dec23f577fca3713f3b88a431a92cd09a16c2316b2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of many external PDF links suggests a link farm or SEO poisoning attempt. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the lure.

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=absceso+hepatico+etiologia+pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/dad7b5_afc7bdfed1ac4833aa65babd83f490b2.pdf
    • https://static.usrfiles.com/ugd/3bbd68_d744e40ff172467d8c8c6a00fc108b6f.pdf
    • https://static.usrfiles.com/ugd/ccb1c6_1b1680d45de84a169160167d59bb815f.pdf
    • https://cdn.shopify.com/s/files/1/0449/7778/2952/files/pettai_cut_songs_isaimini.pdf
    • https://cdn.shopify.com/s/files/1/0457/7129/2838/files/easy_english_story_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8138/files/applied_social_science.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/60316893025.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8246/files/34401695084.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3534/files/pdf_to_editable_word_converter_offline.pdf
    • https://cdn.shopify.com/s/files/1/0432/0962/1664/files/78545322345.pdf
    • https://static.usrfiles.com/ugd/c2007e_674c9a2790bf4b35ad84717d92c19f14.pdf
    • https://static.usrfiles.com/ugd/79e0dc_762c1f2b31df45bc9eec609d343815d1.pdf
    • https://static.usrfiles.com/ugd/253000_2c018e5fc2ef4d40bae8d6e59d647017.pdf
    • https://static.usrfiles.com/ugd/99afdc_9577c0242e444edd99f28380871c9c59.pdf
    • https://static.usrfiles.com/ugd/99965f_66eaf65e5ae046cd8f2b5e8c452ab975.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_off00007a76.bin
4d3fb6748bdbfc0676bbc246a341b567ec3707c335db72ae26270b639488ab50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A76 1684 bytes
font_01_sfnt_off000082da.bin
d0bba80f9ffe36ace9446e178e2313490753ecaa875fc2b86489080dfb11ce5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82DA 5452 bytes
font_02_sfnt_off00009560.bin
892a6464436e1b4c7aa895c597cd980e642c1547a9953dafb777649e2ce49c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9560 10540 bytes

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