Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8be80cdf5e9e000…

MALICIOUS

PDF

44.8 KB Created: 2020-08-13 03:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8ff3507f7f495359af15d1fe3fd7405 SHA-1: b248af4424343767f71ded788b37cf7771cc4b8a SHA-256: c8be80cdf5e9e000158926e0714b883192160edc8821ca28c549770ed6f76022
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to external PDF files hosted on various domains, including a known malicious redirector at `ttraff.com`. This suggests a link farm or redirection tactic to obscure the ultimate destination. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=bacterial+genetics+pdf
    • http://files.phylliskoppel.com/uploads/1/3/0/8/130814052/rixulagopojes.pdf
    • http://zulufamim.knoxchurchperth.com/uploads/1/3/2/8/132814930/4564385.pdf
    • http://dokoz.northerncoloradopetiteballerinas.com/uploads/1/3/2/6/132682879/3533f614.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/kejimanulikarimesefukej.pdf
    • https://cdn.shopify.com/s/files/1/0428/7925/4694/files/tesinujizikamirinu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3356/7125/files/80935731063.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/40501863912.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7936/files/embryology_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/varizedo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0210/0899/files/38346978993.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/gatovofowex.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/wepabiwumer.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/51941166606.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/bekibidibonire.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/42290882113.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_off000071fe.bin
a4aa383e494d4ddf49227a432516cb1ff10ba6613552b7c717bf82be238d2496		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71FE 5372 bytes
font_01_sfnt_off0000844b.bin
002e30d9f2af221d31cc4a211f98b410c8e825f4bfbe66e23ad3968aae907f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x844B 9964 bytes

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