Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a283a543796507…

MALICIOUS

PDF

46.9 KB Created: 2020-08-30 14:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99edff807a531748fc9e774b6d34716c SHA-1: 893febd4170237dd7dd48468513dcb92159c8eb0 SHA-256: 49a283a543796507a0ae58bfe7342359ef53fa90244013e37c228225bcd6407f
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a domain known for malicious redirectors. The document body, though corrupted, contains text suggesting it is a lure for statistical books, and one of the primary links is to 'ttraff.cc', a known malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=libros+de+estadistica+basica+pdf
    • https://static.usrfiles.com/ugd/ae15ca_8eeadce05f6641f886e72a5f67a8905d.pdf
    • https://static.usrfiles.com/ugd/b8c837_96565941d7c74845925001f1952ddc42.pdf
    • https://static.usrfiles.com/ugd/0a052f_a1eb358def854d9b90e4925bc1cc9f29.pdf
    • https://static.usrfiles.com/ugd/ed64d2_7b9c17d711fa4f4488d23921c0c92c37.pdf
    • https://static.usrfiles.com/ugd/8c0e65_f69d7683b60548e394bb85acddaacca1.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5240/files/35630343229.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8903/files/baby_carrycot_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/7562/4350/files/15895133404.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5645/files/nokijotepudarovonebibi.pdf
    • https://cdn.shopify.com/s/files/1/0462/7903/2992/files/likulubese.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0018bb3149a436194e978a19552e0c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4ad8f2148d84b52aa9d9178b43073df.pdf
    • https://static.usrfiles.com/ugd/b4609a_969135ffb7834a1780b01da485327b45.pdf
    • https://static.usrfiles.com/ugd/3f80ec_efee07cc2e7b4c938615f564082a5420.pdf
    • https://static.usrfiles.com/ugd/902d29_0f66471389d9462392dc35700bb3c478.pdf
    • https://static.usrfiles.com/ugd/c1108c_4fe8cbd529d547ffa37b856a5827f88b.pdf
    • https://static.usrfiles.com/ugd/b8c837_6496ba0ea7e0410296fce502a7dc1e01.pdf
    • https://static.usrfiles.com/ugd/b8c837_65373540caa0459fa6610c8336131adb.pdf
    • https://static.usrfiles.com/ugd/90423f_0e1c0ce2a7e640f3922dd25f71fbd9b2.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_off00006925.bin
c72674215bb4e11d5794c6a1e34a6a9f01c2b0d088158a8b323aea67c9c091b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6925 4880 bytes
font_01_sfnt_off000079c1.bin
d356f26dfc211271634bb833a1c461d01af6e32aeced856582e285c208a74e6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C1 11260 bytes
font_02_sfnt_off00009e4e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E4E 4324 bytes