Malicious PDF — malware analysis report

Static analysis result for SHA-256 0027bc014d2dbd0b…

MALICIOUS

PDF

45.7 KB Created: 2020-09-04 06:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80304d44b5e59ae8d352f634ee74a1bf SHA-1: 5ddddd39e7a0bbc57b04c4ff945a25b5684f017d SHA-256: 0027bc014d2dbd0beb22473c2bce42c2c03e2c14592912f37ab640f06bd9ffd7
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=latest+android+version+phones+2018'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to benign PDF files, likely to improve search engine ranking and mask malicious activity. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=latest+android+version+phones+2018
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/c88839_b39c176e25b748a7802b91af8ee138a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c858a73eb3447a9b3c756bf73a9a67f.pdf
    • https://static.usrfiles.com/ugd/7c30af_89626c364d004a24bab6f09231e6686e.pdf
    • https://static.usrfiles.com/ugd/99a8f2_deb717b7025d4592936099a20ffeb74e.pdf
    • https://static.usrfiles.com/ugd/ddb60a_7230d022da324cb7a37d6e353ea9a905.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_ea9eaefc78774f0297c9f97d173b2fab.pdf
    • https://static.usrfiles.com/ugd/affaa6_dc82f4d81dfe4c0fa73da94ce7f80050.pdf
    • https://static.usrfiles.com/ugd/de60da_e42a68567ddd401585fffb3f3a4a09d0.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/god_made_the_country_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7016/8986/files/slayer_monsters_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/lumodolonevamekazivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/setikefopotogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9967/6060/files/jacksonville_jaguars_2017_injury_report.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ef.bin
36ae38f7da0fc529cc7a308d970b82e8131fb7f3a9e6bc468b683eac17ea392f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EF 5324 bytes
font_01_sfnt_off000076ff.bin
99b6a833d7e34aadf572c1f54900065f7a82535154833c26a894b1abe85ecf4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FF 10676 bytes
font_02_sfnt_off00009b97.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B97 4324 bytes

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