Malicious PDF — malware analysis report

Static analysis result for SHA-256 10878c69d11863e3…

MALICIOUS

PDF

45.2 KB Created: 2020-08-06 06:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b35d2cd4cb708d14305303b72e9c990a SHA-1: 0ff0fc135636f5a498fc4a2691d032ec79eb6877 SHA-256: 10878c69d11863e3b67a6c0366a9daac2ba00ca38cbcc0acf87a82e53234a30e
154 Risk Score

Malware Insights

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

The PDF contains a lure for free German learning materials, but the embedded links redirect to malicious infrastructure. Specifically, the link 'https://ttraff.com/pify?keyword=apprendre+allemand+pdf+gratuit' is a known malicious redirector. The document also contains a large number of links to other PDFs, likely for SEO manipulation or to spread malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=apprendre+allemand+pdf+gratuit
    • http://files.mountainmayhemfireworks.com/uploads/1/3/0/8/130814129/6407935.pdf
    • http://files.elisabethmartorell.com/uploads/1/3/0/7/130739971/zizaju-bisulagujozexed-firapu-zajebezeligoze.pdf
    • http://saruxomoz.beansplaybox.com/uploads/1/3/0/8/130813612/1898351.pdf
    • http://files.hannahhsieh.com/uploads/1/3/2/6/132682048/5880612.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/dedodolal.pdf
    • https://cdn.shopify.com/s/files/1/0434/4243/8310/files/62283011865.pdf
    • https://cdn.shopify.com/s/files/1/0431/1590/5185/files/tugezaxijadolel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9989/8531/files/iphone_6_plus_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/56913252836.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1972/files/58522491177.pdf
    • https://cdn.shopify.com/s/files/1/0429/2011/6387/files/978118298.pdf
    • https://cdn.shopify.com/s/files/1/0430/9087/0423/files/58081524937.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9966/files/rutokikoju.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/40665977729.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/giludu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/midajusoxoruxavixanefiwob.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fb8.bin
e37d0540ce59821dee23709925055c7ea0eddbc2dcc600f06e69e885de4928ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB8 5172 bytes
font_01_sfnt_off00008142.bin
219fa9a0cca4cce3c4eb9c7a6b32bfed648a28f1942174520d3b073c5891da46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8142 12148 bytes

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