Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9baeb41abadebc…

MALICIOUS

PDF

42.6 KB Created: 2020-09-07 21:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0aafb370fbebbddac7edfa3cd6d58c2 SHA-1: 901f8da1138a6fb22a83719ac1ad393bc87eb2c9 SHA-256: cf9baeb41abadebcf1ffd4e4d0be1327fb984dfa4ef9db97764f0d6112ce2350
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary malicious link being a redirector. The document body, though corrupted, contains text suggesting a lure related to 'bright memory mobile apkpure', which aligns with the malicious redirector's keyword. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded URLs points to a distribution mechanism.

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=bright+memory+mobile+apkpure
    • https://static.usrfiles.com/ugd/b8c837_2dd8fe26987a44559f20127366d93054.pdf
    • https://static.usrfiles.com/ugd/cf5aa9_273d1e441b604059a39b87e72a42f028.pdf
    • https://static.usrfiles.com/ugd/e3ff21_8674af98040e4578a7fac1e727053f5e.pdf
    • https://static.usrfiles.com/ugd/b148e5_ac82859905c14775acfded1485de8701.pdf
    • https://static.usrfiles.com/ugd/dcbeda_7273fc8546fe4ab2a62c05bbbf00466b.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2769/files/bharathiar_university_phd_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/puxitadarawedaxisokidaxu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/poweredge_fx2_fx2s_cmc_user_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/0413/2508/files/zapowenudazabedozajeja.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/teroku.pdf
    • https://cdn.shopify.com/s/files/1/0432/6434/4219/files/79423820623.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_off000066bd.bin
fc1d81fb19c31190526d7a7bf8c798822e1364d938d5c996028ff47ca1c4b0d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BD 5412 bytes
font_01_sfnt_off00007904.bin
35dc991b7f13f28d9f3595d9db5b89713f47f956d08b55478be7470b6a7a7edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7904 10360 bytes

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