Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9880606d82efa6…

MALICIOUS

PDF

41.3 KB Created: 2020-09-09 00:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87adb1919310cd08bf7c9c667d6bd693 SHA-1: 5d1eeca3b0843c58f7b30df2e8d1981770029e72 SHA-256: 0f9880606d82efa6a0f925deb3f6aab7ab37a547409fc0f1bbc2aa1e3aed37b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised with a search query, which is a common social engineering tactic to trick users into clicking. The link points to a redirector, indicating a likely attempt to lead the user to a malicious site. The ML classifier also 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.link/wix?keyword=count+empty+cells+in+excel+spreadsheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6559/7342/files/sanerasim.pdf
    • https://cdn.shopify.com/s/files/1/0428/2050/1660/files/sbi_kyc_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1798/files/oxidative_stress_related_diseases.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/book_review_of_the_alchemist.pdf
    • https://cdn.shopify.com/s/files/1/0436/2335/0434/files/70112258991.pdf
    • https://cdn.shopify.com/s/files/1/0429/0481/3721/files/76121681268.pdf
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/1105110568.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/creative_business_card_template_psd.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/88377422121.pdf
    • https://static.usrfiles.com/ugd/b8c837_74e3707b6826426d9c56d050c3e0849f.pdf
    • https://static.usrfiles.com/ugd/2ca22b_227719c6080c4cbca02b6304fc8bf5e4.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/51986475490.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/dixaxuxajij.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2186/files/total_war_warhammer_bretonnia_battle_guide.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_off0000642c.bin
4bab221c13cdfe64d43dcafbf13e10d0763963f7e785f4b1c33ec67128b964d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x642C 5388 bytes
font_01_sfnt_off00007657.bin
93ca9206017c40bee417cfceca1eef28aa38261cdf5b4279088eb89c3d39de8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7657 9956 bytes