Malicious PDF — malware analysis report

Static analysis result for SHA-256 af751eb3e290b6e7…

MALICIOUS

PDF

32.9 KB Created: 2020-09-12 06:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6d4f198271d9d8c3f8769c59e9161fe SHA-1: 68e00d77d9e9d4c35de9ef49d57d47de06879885 SHA-256: af751eb3e290b6e7187ee235b81cfe4f2ca77c7db707cc2975685efd8c8bdee9
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to an 'age calculator apk for android' and includes the malicious URL. This indicates an attempt to trick users into visiting a malicious site, likely for further exploitation or credential harvesting.

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.me/wix?keyword=age+calculator+apk+for+android
    • http://lebodowek.itsbohobaby.com/uploads/1/3/1/4/131453027/fedevelabunu-jinusomosa-bixujulowowukuk.pdf
    • http://babiledi.aspireimmigration.ca/uploads/1/3/2/7/132741389/8147843.pdf
    • http://files.summasportswear.com/uploads/1/3/1/4/131453807/118d8e22a22790b.pdf
    • https://static.usrfiles.com/ugd/a32c20_38928e5959b94e1889b6d0cb25bd31d6.pdf
    • https://static.usrfiles.com/ugd/191a6d_845c52754c4e4caf880bd79a2b16e7bc.pdf
    • https://static.usrfiles.com/ugd/7e6083_01cd82d207fd4635a65cc24da067852c.pdf
    • https://static.usrfiles.com/ugd/a86d68_ba1327eadbac455e93413b693049bb00.pdf
    • https://static.usrfiles.com/ugd/6e3131_6b8e98fd44fc4e9395f415a8128cd111.pdf
    • https://static.usrfiles.com/ugd/238140_549a7150f2484ac999d655ac541d78c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e001332d39b4cd69e54935833f64099.pdf
    • https://static.usrfiles.com/ugd/b97cba_017a8b9dbb9540d088e677147799902f.pdf
    • https://static.usrfiles.com/ugd/0511f5_d545b7e40061407f812e0be525b581ff.pdf
    • https://static.usrfiles.com/ugd/23b571_79180a52905f4cd8943193b8cfd7a9ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_724b579371b74bbeb9df5a1c6cf6dc18.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_off0000434a.bin
288fdbf275b7008e08ddac83f51c6fca83e9ec2a6a81b102ab5c6e4e291e913e
pdf-font-stream PDF embedded font (sfnt) at offset 0x434A 5196 bytes
font_01_sfnt_off00005515.bin
e8fd5ffb79d51c383de28a2aea6e047d2bfb66fcc5dced219d60cb0333d2e897
pdf-font-stream PDF embedded font (sfnt) at offset 0x5515 9864 bytes