Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc422ad5f2cb0ad2…

MALICIOUS

PDF

38.0 KB Created: 2020-09-02 04:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20662a33cd04960e4a6299f708cb560b SHA-1: 307d4c67436585c5159038a3d92c26db58d62d51 SHA-256: fc422ad5f2cb0ad2e16ed53317275cdd7f28bb316e36ecc72023528b5342f8a3
154 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.club/wix?keyword=broken+hearted+girl++song'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDF files hosted on static.usrfiles.com. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same malicious URL, suggesting an attempt to lure the user to a potentially harmful 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.club/wix?keyword=broken+hearted+girl++song
    • https://static.usrfiles.com/ugd/b8c837_9f8e99e0d2064a16a84b997467f63680.pdf
    • https://static.usrfiles.com/ugd/911c12_dc3d064b0a0a44739815b53a80352f41.pdf
    • https://static.usrfiles.com/ugd/162fe6_dc7c96d42bad48c2a17d1e36ea999254.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_5520a075d7604faa8319c4dc602d3eb0.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/siduputisusubolezemozut.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3c3082f7c82491f8803818f1078a616.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd2ae9ae8ce14bfdb84d20c21b217453.pdf
    • https://static.usrfiles.com/ugd/b444d4_bf112be9fbb24ecaa531b61d87331f80.pdf
    • https://static.usrfiles.com/ugd/17beed_7b39e096658e492c8153a8dc17742e2a.pdf
    • https://cdn.shopify.com/s/files/1/0439/2786/3464/files/28135193915.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/heaven_door_lyric.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/34893067827.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/mavevuxominebimofepuzixik.pdf
    • https://cdn.shopify.com/s/files/1/0438/6314/6656/files/ncaa_bracket_editable.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_off0000582a.bin
ba419d66a9eb6a58031ab9c33fd2e05d10159611cf48b4ed61fb611f6e04ff41
pdf-font-stream PDF embedded font (sfnt) at offset 0x582A 5200 bytes
font_01_sfnt_off000069d8.bin
ff1a1612dd2824dafe4e72dc0557e1e2afe51f355692f0bae51e20e766b40fbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x69D8 9820 bytes