Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50f2ee400866ccf…

MALICIOUS

PDF

47.3 KB Created: 2020-08-31 05:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9e45917a8ed1254917c6e92d94c90e6 SHA-1: f2fc5057349094074e169bab37e7211b6667d0ba SHA-256: a50f2ee400866ccf3b898341ee350fad6201907984d6711fbc5cde86c6aeabfb
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, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm. One of these links, https://ttraff.club/wix?keyword=dinamika+penerapan+demokrasi+pancasi, is flagged as malicious by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly indicates maliciousness. The document body is heavily obfuscated but contains the malicious URL, suggesting the primary purpose is to redirect users to potentially harmful content.

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.club/wix?keyword=dinamika+penerapan+demokrasi+pancasi
    • https://static.usrfiles.com/ugd/865d50_7474356a7255452f9b84da4933e6a4fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_829bbc5a50bc4197b2ca552115d4490c.pdf
    • https://static.usrfiles.com/ugd/b8c837_21d6ff3c49214fa6ac49425e5d180274.pdf
    • https://static.usrfiles.com/ugd/b8c837_a48aadfae073462e9cb75e0e7d8bd031.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_76c4ca5d15fa4b74aaacc71a89b2f4bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_bcf8ae4208574a229b816d0d778b054c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e29c1580c904fb5afabe02370fb5898.pdf
    • https://cdn.shopify.com/s/files/1/0441/0182/8760/files/96820342776.pdf
    • https://cdn.shopify.com/s/files/1/0435/2235/9451/files/demokratis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/toviwokigoburupod.pdf
    • https://cdn.shopify.com/s/files/1/0437/7300/1877/files/wukosutugogar.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3026/files/balettan_molalledi_song_320kbps.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/jekelixugis.pdf
    • https://cdn.shopify.com/s/files/1/0438/2153/1293/files/precalculus_arithmetic_sequence_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/pexedipozonigonitonunokik.pdf
    • https://cdn.shopify.com/s/files/1/0432/6549/1107/files/ncert_maths_book_for_class_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9271/files/semasosi.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_off00007c1e.bin
159a54d123f15833611efd1419f7113b1aa6cfbaf68e25b4e539291d6ff5eae8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1E 5252 bytes
font_01_sfnt_off00008ddc.bin
2c1d4c16481a69a6e425f7115f0b4f8792266aa853e23b36db8b09dc62b9e679
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDC 10076 bytes