Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0748801e8c1aa4…

MALICIOUS

PDF

47.1 KB Created: 2020-09-12 00:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c040a05a867dbfda5554ec65358a3ef SHA-1: 371b6a36356597131e79c40bee41652ae70d5ba6 SHA-256: 5a0748801e8c1aa4e66a263215be047eab9a4ca33c805b94682e0a29a7acadea
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector disguised as a search result for 'how many sheets in excel 2007'. This redirector likely leads to malicious content. The document also functions as a link farm, pointing to numerous other PDF files hosted on various domains, suggesting a SEO poisoning or content spamming campaign. No scripts were extracted from this sample.

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/pify?keyword=how+many+sheets+in+excel+2007
    • http://files.wolfemountain.com/uploads/1/3/1/6/131636978/fufitosavivodu-lajugigise.pdf
    • http://files.nvclosedeals.com/uploads/1/3/2/6/132681647/pinopiredumuz-veviwonip-xuvigopoki.pdf
    • http://files.collegepark4u.org/uploads/1/3/0/7/130739415/9700813.pdf
    • http://dakakaxi.thewaveinspired.com/uploads/1/3/0/7/130775219/kowavolavad-gawiwelepoledo-fikufufep.pdf
    • http://files.creeksideband.com/uploads/1/3/1/3/131384789/3301404.pdf
    • http://files.publichealthmuseum.org/uploads/1/3/1/3/131384789/a826b1b39.pdf
    • http://bogew.barcfriends.com/uploads/1/3/0/9/130969264/363dbad.pdf
    • http://xoperuji.bitcoinerpro.com/uploads/1/3/0/8/130874050/7899354.pdf
    • https://static.usrfiles.com/ugd/a0905b_9d22cb56aae84a88a5eaee7a908e5a85.pdf
    • https://static.usrfiles.com/ugd/b8c837_645c089ac308464b8c1b746283966581.pdf
    • https://static.usrfiles.com/ugd/564d2e_b94089da39274b908b92897028ffd983.pdf
    • https://static.usrfiles.com/ugd/de02f3_f62a0d9737ea411784be94bce8712441.pdf
    • https://static.usrfiles.com/ugd/c0b427_3ae79ad648fa477ead2f7239734e9205.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_1d7f728feb2b4cceb06b1786d8c3c38f.pdf
    • https://static.usrfiles.com/ugd/a838c0_0f8fb67358744676b832949cc42e3154.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006557.bin
0439a5ba0796287cdb8225bdc683495596437e2aec57a1c0cf6dd9d061623fc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6557 5520 bytes
font_01_sfnt_off00007815.bin
a1d5154277c22eda2a9f9bd6560ce8b0587d59bceb77cc662aab9c8ae13606d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7815 9944 bytes
font_02_sfnt_off00009a4d.bin
f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4D 16144 bytes