Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ce1b84fed4f2ea…

MALICIOUS

PDF

50.2 KB Created: 2020-08-29 21:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef40e46a8f7f2425e287dae79ac99a92 SHA-1: 361ae67ff63cd0f10ad16da9f3efd7147052a562 SHA-256: 92ce1b84fed4f2ea3fd4f53b0ae499c4ac384d7d60bea28b57f5ec4440513cfe
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=analisis+morfologico+adjetivos'. Additionally, the PDF exhibits characteristics of a link farm, with numerous external links. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector URL is sufficient to indicate a malicious intent, likely to lure users to a compromised site.

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=analisis+morfologico+adjetivos
    • https://static.usrfiles.com/ugd/b8c837_50c6e22575b8420095f916db2e0d5244.pdf
    • https://static.usrfiles.com/ugd/a76634_f288625e6eab4995bfd8c6b87f652250.pdf
    • https://static.usrfiles.com/ugd/b50c55_4ab1ceeb815e4839916f0209c7c20fdd.pdf
    • https://static.usrfiles.com/ugd/7f16bd_1f19ba7ce311464389b2af12f3f3a038.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/4261437521.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/pebetu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7931/9196/files/givasamotoketakorekilibin.pdf
    • https://cdn.shopify.com/s/files/1/0437/8542/0949/files/29032890580.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/sibunelulexapokixodo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/60045156474.pdf
    • https://cdn.shopify.com/s/files/1/0434/7235/5478/files/jefuzenemomiwenusamufap.pdf
    • https://static.usrfiles.com/ugd/b8c837_e09e6bdd62d4495cab30ac10ada34445.pdf
    • https://static.usrfiles.com/ugd/b8c837_20129ee27a4044baa80fd4f7fed8f98a.pdf
    • https://static.usrfiles.com/ugd/18f527_51b24b6c75b04069861e9255a11ba2c6.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_off00007915.bin
275c953bef740d1629ddc802e590057bbf1cff8f9427263d006a7ee7d939999d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7915 1956 bytes
font_01_sfnt_off00008207.bin
ff6f0672955b5424ec87db6d9f0d711bfd5230cbaef1f930645a05048282da41
pdf-font-stream PDF embedded font (sfnt) at offset 0x8207 5464 bytes
font_02_sfnt_off00009490.bin
a0f6f48897e9a09a595e98f2a3a3b9003d50c8efb30e8f8d82a2e15111321d31
pdf-font-stream PDF embedded font (sfnt) at offset 0x9490 11564 bytes