Malicious PDF — malware analysis report

Static analysis result for SHA-256 af78a1489b66abc4…

MALICIOUS

PDF

49.7 KB Created: 2020-09-06 04:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd1c888d681e75b75aa31a8556dcbf59 SHA-1: 36bdce56fffbdc391936e7a6fabccb40f18890ea SHA-256: af78a1489b66abc4e2dc7b05859d78b184f420784e2691657a691b1137b54265
150 Risk Score

Malware Insights

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

The PDF contains a deceptive title and a large number of embedded links, many pointing to benign Shopify URLs, but crucially includes a link to a known malicious redirector at 'https://ttraff.me/wix?keyword=chacha+bhatija+comedy+video'. This suggests a social engineering tactic to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=chacha+bhatija+comedy+video
    • https://cdn.shopify.com/s/files/1/0439/9611/9198/files/bible_characters_study.pdf
    • https://cdn.shopify.com/s/files/1/0463/5177/7954/files/visoja.pdf
    • https://cdn.shopify.com/s/files/1/0430/8241/6281/files/36256757970.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2864/files/sri_suktam_telugu.pdf
    • https://static.usrfiles.com/ugd/b8c837_54174a709f984c2095b8e28430d22a9e.pdf
    • https://static.usrfiles.com/ugd/e6092c_114b6a93b7664d02b04bf352b2329356.pdf
    • https://static.usrfiles.com/ugd/3bbd68_e5772a2b21f5447cb69988b05b180425.pdf
    • https://static.usrfiles.com/ugd/83f04e_c9ec50d72f9a4b85add4cf3e93b0e90b.pdf
    • https://cdn.shopify.com/s/files/1/0466/2984/7205/files/icarus_mythos_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/atrophia_maculosa_varioliformis_cutis_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0469/0296/8482/files/to_whom_it_may_concern_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0437/7110/1346/files/the_longman_reader_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/5761/8850/files/65885221501.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_off00008614.bin
db8505aef512b4ab9c9e792d01671c64d88242776bc7ffb9094fc9c81d9e0b44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8614 5156 bytes
font_01_sfnt_off00009784.bin
187c0cd6563f809ba320f5173203066b48911aa6477e82676af65d643824b767		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9784 10160 bytes

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