Malicious PDF — malware analysis report

Static analysis result for SHA-256 3778f5809dff50e2…

MALICIOUS

PDF

50.6 KB Created: 2020-09-07 02:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc22fbb3601ec83d75d67d270498fcd5 SHA-1: c6ac5f7dc022555ad1359bfa6ba75b78b1954d6d SHA-256: 3778f5809dff50e26afaf3df2b6288d039bcc2fde3484cb7cc31ad6576315e45
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector disguised as a 'proof of child support payment template', which is a common social engineering lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link points to malicious infrastructure. The PDF also contains a large number of links to external PDFs, suggesting a link farm for SEO poisoning or to distribute further malicious content. The ML classifier strongly indicates maliciousness.

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=proof+of+child+support+payment+template
    • https://static.usrfiles.com/ugd/b8c837_93fb442f601d4f1396acf8fe3e42e002.pdf
    • https://static.usrfiles.com/ugd/822ecd_41b90aadc3e5411b95cc78354070c262.pdf
    • https://static.usrfiles.com/ugd/08fe48_eb101db1e8a64ed39fe4df3cd5bef30f.pdf
    • https://static.usrfiles.com/ugd/d6b5da_23623e73f53443bbb4a3338b2ab65259.pdf
    • https://static.usrfiles.com/ugd/c345b0_9a5c0b12a133464e9a4fbc787eca3a71.pdf
    • https://static.usrfiles.com/ugd/fa32a6_e02b59b0ca274b979fe4c736361315fc.pdf
    • https://static.usrfiles.com/ugd/8da65f_ba14d2f95c39466aae94c35e119c4cc3.pdf
    • https://static.usrfiles.com/ugd/cf14a4_f47091c6ee71425aa7d250056e06ef94.pdf
    • https://static.usrfiles.com/ugd/b8c837_557d8fe67fc84be5bb13c53a8b341264.pdf
    • https://static.usrfiles.com/ugd/843280_ffc8f73b78294228a2320f6f1ccfffcb.pdf
    • https://static.usrfiles.com/ugd/b8c837_15387c28c41044aba3c3c4ca373d09cc.pdf
    • https://cdn.shopify.com/s/files/1/0431/5211/3820/files/linear_gradient_css.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/easton_md_weather_hourly.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/48124624883.pdf
    • https://cdn.shopify.com/s/files/1/0429/2752/1948/files/58318669167.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/tozinesuraneluwaxebosot.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_off0000865b.bin
27856c6dbf9745b5a4fc143002d876d591874590ecc59915203927ec97a63024
pdf-font-stream PDF embedded font (sfnt) at offset 0x865B 5496 bytes
font_01_sfnt_off000098f2.bin
de945a6019cac5958c1787ac7a8deca3dbad627b579db3f2a3181416467372af
pdf-font-stream PDF embedded font (sfnt) at offset 0x98F2 10500 bytes