Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f3bf6bd2be5746…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 01:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dff0f8ea8537fa43a0e8164b31d247de SHA-1: 1506298168e77b8c0c7433aebe377b6d7c434275 SHA-256: c8f3bf6bd2be57467f7f5224506313f3a1e5aa3da1eeede159ee3a9eb49616df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to the malicious redirector 'https://ttraff.ru/wix?keyword=telecg+wendey+shay', which is a strong indicator of malicious intent. The document body, though heavily obfuscated, contains this URL and appears to be a lure for the user to click it. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning attempt, further supporting the malicious classification.

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.ru/wix?keyword=telecg+wendey+shay
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/26366099839.pdf
    • https://cdn.shopify.com/s/files/1/0428/4583/1335/files/utorrent_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0432/0559/1200/files/sowosisofarozewitoripese.pdf
    • https://static.usrfiles.com/ugd/c7a620_879516d27886497d8a2cbeb68095fb5f.pdf
    • https://static.usrfiles.com/ugd/10a4aa_db6eb21c0bdd47c48f4c79f2c29f8859.pdf
    • https://static.usrfiles.com/ugd/9edd50_71c41a7014414c57a5a614a12bc78297.pdf
    • https://static.usrfiles.com/ugd/60933b_2d9f242b8209496e91afe4bce2490266.pdf
    • https://static.usrfiles.com/ugd/d902bb_24b89f02bbd64bb6adc8dd448eba9d70.pdf
    • https://static.usrfiles.com/ugd/02beb7_15e5b6f17ef44dd59f0dbdbf6b5fe5e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0a240b999dd4962a9aaa97d70bbd310.pdf
    • https://static.usrfiles.com/ugd/d216cb_0cee0728407e4ddd8d5e257edd3996be.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/alpha_bravo_charlie_episode_10.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/rukitejorimalajarex.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/brain_dead_13_android.pdf
    • https://cdn.shopify.com/s/files/1/0441/2666/6904/files/java_7._2_32_bit.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_off0000623f.bin
4dbdaf151101623484924977832fc1f2eb454904465e9943f23779d168eb9595
pdf-font-stream PDF embedded font (sfnt) at offset 0x623F 5248 bytes
font_01_sfnt_off0000742c.bin
7ec0f05261f38fc165d9e43e912496cbd8b128eae9278955448ff68bc54ace48
pdf-font-stream PDF embedded font (sfnt) at offset 0x742C 10816 bytes