Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5857f313ed6b9f3…

MALICIOUS

PDF

48.3 KB Created: 2020-08-31 02:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3424688a7859015ee9f609efb9e9af06 SHA-1: 15fa018241c07c9957ecee70f91eee66961767d1 SHA-256: a5857f313ed6b9f39869880be897f4251fec5bf98130fae6167080dacbd15ce9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm heuristic, indicating a mass of external links, with the first being to 'cdn.shopify.com'. The ML classifier also strongly flagged this PDF as malicious. These indicators suggest the primary purpose is to lure users to malicious sites.

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.cc/wix?keyword=superheroes+unlimited+mod+1.+8.+9
    • https://cdn.shopify.c
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/7455910272.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/62596507212.pdf
    • https://cdn.shopify.com/s/files/1/0454/3139/0364/files/19496318705.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/cisco_aci_apic_configuration_guide.pdf
    • https://static.usrfiles.com/ugd/b8c837_d850670ac11a4000abbfad43d7352e1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_56c778c42d384d11aaec11678f32ac8f.pdf
    • https://cdn.shopify.com/s/files/1/0435/1403/6376/files/korogeto.pdf
    • https://cdn.shopify.com/s/files/1/0463/9499/8939/files/clearscada_user_guide.pdf
    • https://static.usrfiles.com/ugd/2ca09c_17596b6663fc43ab884838a4c93846bc.pdf
    • https://static.usrfiles.com/ugd/9757e7_2c6cf902c77b437bba9020dcd7fcf8f1.pdf
    • https://static.usrfiles.com/ugd/a43ec6_392e07b9d504499ab633bf230e0f3a72.pdf
    • https://static.usrfiles.com/ugd/77d535_cc248aa6902042dea472291d1e226a14.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_off000065c4.bin
324c6b2ca09fcc0d51598b40235938e71c7bc2345b55d7f9f1249703fd39c4e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x65C4 5524 bytes
font_01_sfnt_off0000786d.bin
437a7b30f696adf105e36f8654c658a6dc23736f580afe0275bbdfb32928e07f
pdf-font-stream PDF embedded font (sfnt) at offset 0x786D 10808 bytes
font_02_sfnt_off00009d7f.bin
0143f1303204e677e4f5ca9ddc1e3137fc305ad20a48f3e13082630f190f0e83
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D7F 16064 bytes