Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a50b4ec68e4dd1…

MALICIOUS

PDF

34.8 KB Created: 2020-08-26 16:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecccdb35f5fae918febb178ce55b940f SHA-1: 129e42316c727add8f5a1f02a1200680f68ec2dd SHA-256: f2a50b4ec68e4dd13ff75e775f834a7463d54eecdbd6ef374ffa8f8c7f2d14af
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, with the primary URL `https://ttraff.com/pify?keyword=normal+hemodynamic+values+pediatrics` identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF files hosted on various domains, suggesting a link farm or redirection strategy to distribute malicious 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.com/pify?keyword=normal+hemodynamic+values+pediatrics
    • http://files.negleyelementarypta.com/uploads/1/3/1/3/131383630/wikuxukiledodadev.pdf
    • http://files.atkinsgeneralconstruction.com/uploads/1/3/0/7/130739021/8d96d51d8d66.pdf
    • http://files.rossbrownscience.com/uploads/1/3/1/1/131163834/rimunukavizoje-fawaraduje-xujori.pdf
    • http://files.nasafacs.org/uploads/1/3/2/3/132303269/36716e.pdf
    • http://files.theoxfordscientist.com/uploads/1/3/1/3/131380175/8582850.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/95548132764.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/english_speaking_course_book_file.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1555/files/5207241661.pdf
    • https://cdn.shopify.com/s/files/1/0430/8559/4775/files/talipunuke.pdf
    • https://cdn.shopify.com/s/files/1/0435/6653/0719/files/47088397834.pdf
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/1352262487.pdf
    • https://cdn.shopify.com/s/files/1/0435/6676/0095/files/6246617312.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/bangla_academy_english_to_bengali_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9544/files/bhagavata_purana_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/61149659229.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/97283814586.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/fundamentals_of_bacterial_plant_pathology.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3866/files/possessive_nouns_worksheets_for_6th_grade.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c51.bin
fe5bf4eb6e3194d13c2ca1225761a94a1a2abded8e32a53c1b4c3f779aac9685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C51 5444 bytes
font_01_sfnt_off00005eba.bin
ec79f49f880ee0c904d18024f8ccfa1c253ddd376b4bb604258a34318b60cc4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBA 9192 bytes

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