Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36c260f732bfbec…

MALICIOUS

PDF

61.5 KB Created: 2020-08-11 05:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f41aa95f05d3fa46fa4ccde44f95f58 SHA-1: 7e732c03b38d49082e85e7d3a481a27f9147a272 SHA-256: c36c260f732bfbec3f662f287230fcc8c5e6424d3585613ab6f091496fb2b9ee
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a redirector link to 'ttraff.ru', which is known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'English vocabulary in use advanced pdf' and the malicious URL, suggesting a lure to download malicious content disguised as an educational resource. No scripts were extracted from this sample.

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.ru/pify?keyword=english+vocabulary+in+use+advanced+pdf
    • http://files.ag-energy.com.au/uploads/1/3/1/8/131856545/pilakatebej.pdf
    • http://lulurum.itsbohobaby.com/uploads/1/3/1/3/131379858/weseje_godiraxo_xetetubev_nadovozosib.pdf
    • http://files.princetonclubbiggestloser.com/uploads/1/3/2/6/132696214/1779923.pdf
    • http://lidojix.piolkdesign.com/uploads/1/3/0/7/130776485/neretewukuba.pdf
    • http://files.stlcreativelandscapes.com/uploads/1/3/0/7/130739222/ef587c6cf.pdf
    • https://cdn.shopify.com/s/files/1/0427/9464/7719/files/73296024313.pdf
    • https://cdn.shopify.com/s/files/1/0437/7001/9998/files/notifier_conventional_smoke_detector.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/44584158452.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/55335253093.pdf
    • https://cdn.shopify.com/s/files/1/0435/3032/2084/files/xoreje.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/96073548743.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7875/files/gepav.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/lovepi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15501301831.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/72096091442.pdf
    • https://cdn.shopify.com/s/files/1/0430/0547/7023/files/72852370983.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9366/files/24251706433.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000c49c.bin
17672b46a78a0a021657b8579ef5718bf08a46d56ffeef96ea3649a1169a45d4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC49C 20664 bytes
font_00_sfnt_off00005dd5.bin
98e78c7ab7455d1bd9ff65097144aa5964d0ec7c88fd7e475114fb4d4ff53448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD5 5676 bytes
font_01_sfnt_off00007118.bin
df8a04a45a7c8be75acb52437376a4c1f47027d2a4ffa1e7619a48afe7b57f2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7118 11600 bytes
font_02_sfnt_off000096b0.bin
751dade4b07c9577ccaaec7fe9f97a953b3026735236c75e918b8b72bcd13a9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96B0 14892 bytes

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