Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75fda2af278b694…

MALICIOUS

PDF

74.0 KB Created: 2020-10-02 04:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a7b2b09a1f384768d3f7b62380ee9b73 SHA-1: ee580b5f3323acf294833378d243b57bda1232a8 SHA-256: b75fda2af278b694a06f1665a55456089331aaa134d6602e596569961cbc9932
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains the same URL. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic to increase visibility. 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://cctraff.ru/strik?keyword=ecuaciones+diferenciales+ordinarias In PDF document text
    • http://files.rjlakerphotography.co.uk/uploads/1/3/0/9/130968996/6083806.pdfIn PDF document text
    • http://migezu.pwcyoga.com/uploads/1/3/0/8/130813834/0584f65.pdfIn PDF document text
    • http://files.missabellahousekeeping.com/uploads/1/3/1/4/131453451/559c20c1cd590.pdfIn PDF document text
    • http://gikugukem.cobbosseeconteesnowmobileclub.com/uploads/1/3/0/9/130969521/6c423cf50a18a.pdfIn PDF document text
    • https://site-1038762.mozfiles.com/files/1038762/22237466308.pdfIn PDF document text
    • https://site-1037082.mozfiles.com/files/1037082/jevimabisudarofamirube.pdfIn PDF document text
    • https://site-1039898.mozfiles.com/files/1039898/wunanajixusopewuzalidi.pdfIn PDF document text
    • https://site-1038477.mozfiles.com/files/1038477/tuwekofogajokupovuwade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/5553/0151/files/mainland_wars_unblocked_google_sites.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7542/3396/files/wegoxulopukusosolewudu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5388/3293/files/winakozabawekesupi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1391/7856/files/wusenijusapov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/9844/1375/files/tikopopa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1095/1838/files/shenron_wishes_dokkan_set_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7578/7162/files/how_to_replace_amtlib.framework_cs6_mac.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBA 3036 bytes
SHA-256: 99ded188e226e39593a4890b6298adbe856badd97d15f700ba9500dddfb2f533
font_01_sfnt_off0000b983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB983 4972 bytes
SHA-256: bc5c8f9fde5ce19423f19a94f89c1da9deda706971fdbc2cdf3c714853bc19b1
font_02_sfnt_off0000ca7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7D 18096 bytes
SHA-256: c69c626d93b3b401858bc0bbef8877bd363ce36a2cf80fcc9256d26c5ebdd497
font_03_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 16344 bytes
SHA-256: b8af9a3753cb33b0c58b32bd171f5572e84f68efc03747143c15f2c9a4b9ed9a

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