Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e684bb0b4a1c7f…

MALICIOUS

PDF

35.0 KB Created: 2020-09-01 11:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d251feb131a77d3b37c3021d34012785 SHA-1: ae35177506d0eb09f5802fe28167c4fd173d19da SHA-256: e5e684bb0b4a1c7f6ee505947d1414f4df296f8450dd04d6eb946503b5cc04c7
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is likely intended to lead the user to a malicious site. The document body text, though partially corrupted, mentions 'spreadsheet compare office 2016 not working', suggesting a lure to trick the user into clicking the malicious link. The ML classifier strongly indicated maliciousness, and the PDF structure includes a link farm, further supporting a malicious intent.

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=spreadsheet+compare+office+2016+not+working
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/xusosuwakuxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3778/6266/files/64813653916.pdf
    • https://cdn.shopify.com/s/files/1/0432/1420/9186/files/nilemux.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/rupugojerinu.pdf
    • https://cdn.shopify.com/s/files/1/0446/5842/6019/files/kbc_live_question_answer.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/46038862916.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/eenadu_news_paper_today_ap_telugu_download.pdf
    • https://static.usrfiles.com/ugd/405339_4f9e598231da4c94a9984ab803f8c043.pdf
    • https://static.usrfiles.com/ugd/565485_c7db96b1c1494766b7822aa364c17dba.pdf
    • https://static.usrfiles.com/ugd/9cc572_d22d8cc29fe9442caf156a6f061e8b16.pdf
    • https://static.usrfiles.com/ugd/8b97dd_b6cc772a80324a0cb9358a8cb6e416ac.pdf
    • https://static.usrfiles.com/ugd/f09a9d_23789157ca1c4e2bb918e9b02c61b624.pdf
    • https://static.usrfiles.com/ugd/e4a001_8775e99c6303400f95781557fec89165.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_off00004879.bin
7790f90db9eaa2b4c1bc2847fee89c091439a01bd8b5915e88520f94ec64289a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4879 6276 bytes
font_01_sfnt_off00005dc4.bin
6c9ff65d0eb7e20bd1ec6dc43c9d92017c25f9fffc1aea037790443b07f26c62
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC4 9740 bytes