Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dac77783bb7103…

MALICIOUS

PDF

119.2 KB Created: 2020-08-03 19:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb170a4866f4768487148d26c51acd4e SHA-1: 75368114de4bc104ded874e1bb61c33caac7ec2d SHA-256: a4dac77783bb71034ff2677ae155ab5ec28dad068ab7b1e4b5a3d94d66715337
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector link to 'ttraff.com'. This suggests a phishing or scam attempt, likely to lead the user to a malicious site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of specific payload delivery mechanisms.

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=icao+annex+11+pdf
    • http://files.bethanylutheranrlf.com/uploads/1/3/1/3/131381819/sizumomonogup.pdf
    • http://files.assiniboiaskatingclub.com/uploads/1/3/0/7/130775331/dasam.pdf
    • http://files.holyfamilypawtucket.org/uploads/1/3/2/6/132695492/06a19.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/fitilabuvidi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8787/8549/files/jedifewatexef.pdf
    • https://cdn.shopify.com/s/files/1/0437/7742/5565/files/konubanuse.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1480/files/9993539081.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kazapuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/suvilanomafofovaligitusat.pdf
    • https://cdn.shopify.com/s/files/1/0440/6660/3158/files/vovevil.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2822/files/zewipinaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61286624564.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/campbell_biology_11th_test_bank.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/gesugasobe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/55478085482.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_off00019d95.bin
dfab8a2b6922596db66f694cc4ead45ce73479ec1d6da2a8ffc233a610a8ae34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D95 4900 bytes
font_01_sfnt_off0001ae6a.bin
3a768b9c43475dc445831e512973208d249003abf9d8fb29c7e15fe54812ce76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE6A 9980 bytes

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