Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f153dba10bafb51…

MALICIOUS

PDF

50.9 KB Created: 2020-09-10 20:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38543a7f3ba06306f623fa29f1954317 SHA-1: 19eb758d0e9839d4d9f9793ff300d903f5cc8a41 SHA-256: 9f153dba10bafb517459ecb329ed951ea2943b5cb7d8143c1c7f1851425213a9
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL 'https://ttraff.club/wix?keyword=sda+zulu+hymnal' is identified as a malicious redirector. The presence of numerous external links, many pointing to domains like 'static.usrfiles.com' and various other subdomains, strongly suggests a campaign to distribute malicious content or conduct phishing attacks by overwhelming the user with links.

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.club/wix?keyword=sda+zulu+hymnal
    • http://sefupaz.innovativesheets.com/uploads/1/3/0/7/130739476/dupoxiwuvojar.pdf
    • http://vusesubi.ps177.com/uploads/1/3/2/3/132302978/8559176.pdf
    • http://files.lbfs.org.uk/uploads/1/3/1/4/131437538/sukenovapimak.pdf
    • http://medidil.fremontbands.com/uploads/1/3/0/8/130874232/kivusikenuguz-bifas.pdf
    • http://files.davidslandscapes.com/uploads/1/3/0/8/130814342/nojasimevapusaxo.pdf
    • http://pizakupi.duogivesback.com/uploads/1/3/1/6/131606289/2ccbe88c47c846d.pdf
    • http://files.theamericangurner.com/uploads/1/3/1/4/131407135/d632373ddc.pdf
    • https://static.usrfiles.com/ugd/2b3f46_9c279c92ef044a2da4584768a98ac17a.pdf
    • https://static.usrfiles.com/ugd/3b0c81_62d176aba6f64ca3b688fef983efa3a7.pdf
    • https://static.usrfiles.com/ugd/55f640_b965c3d6b1f64f8aafd5c4713553c843.pdf
    • https://static.usrfiles.com/ugd/9b33c5_b77dc0927f544f0bb8001e498f824e12.pdf
    • https://static.usrfiles.com/ugd/6290de_4d842c016d8c4f6fb2a84299c145c78c.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/zalikuvaxixomuvimifewow.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/38466120922.pdf
    • https://cdn.shopify.com/s/files/1/0434/5937/9357/files/american_anthem_us_history_textbook.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_off00008c83.bin
a9e53367160b4ec5ef3236190cf9c83a634e65d7fefd1877dfb1a4c071c549c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C83 5044 bytes
font_01_sfnt_off00009d93.bin
564ac409197448dc976b387b28e580ed0acefc7decb33185c416467a876d8f9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D93 9664 bytes