Malicious PDF — malware analysis report

Static analysis result for SHA-256 88edea9f2e1061b6…

MALICIOUS

PDF

40.2 KB Created: 2020-09-02 18:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54dcb969a0b3ef116171c81e72a6837a SHA-1: 4bcb122ffacdd0534ada7b6a7180e5ebb2acf0d1 SHA-256: 88edea9f2e1061b6371b40f99080bb978ac12d5177c2fcb1a413f8584ca57195
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, ttraff.club, which is disguised as a 'family worksheet'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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.club/pify?keyword=family+worksheet+english+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/529dbf_cae83dfb18ac4379812f2eddb4cea101.pdf
    • https://static.usrfiles.com/ugd/2ca22b_227719c6080c4cbca02b6304fc8bf5e4.pdf
    • https://static.usrfiles.com/ugd/89363e_700a3bdeda524f0281059bd35bd92d55.pdf
    • https://cdn.shopify.com/s/files/1/0436/4170/0505/files/free_new_bollywood_movies_hd_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0431/3228/9178/files/sobenokixov.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/discord_jukebot_commands.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pawatofamilafal.pdf
    • https://cdn.shopify.com/s/files/1/0433/2224/5273/files/3587992927.pdf
    • https://cdn.shopify.com/s/files/1/0445/6851/0623/files/zopifagive.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/pomil.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4638/files/marukum.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/janonanetu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1945/files/fixusovadozosezan.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3308/files/transformers_power_of_the_primes_optimus_prime.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_off00005da6.bin
dccc31c14946957aef002748979c7cd2b42bea68d20b4343c2bcc82d81e9ab5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA6 5668 bytes
font_01_sfnt_off000070ee.bin
0d2942b620a64a10f5e939a95b4a53a03461319c3427b17279290c1d1372ce78
pdf-font-stream PDF embedded font (sfnt) at offset 0x70EE 10296 bytes