Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7cf2492ec669e9…

MALICIOUS

PDF

56.2 KB Created: 2020-07-28 10:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e8faa6875d052c4019f2c5ab64d4fb7 SHA-1: 211cae0396cf03729442d529cb94daba01096f7d SHA-256: da7cf2492ec669e940e52f1e8baba6cf5af75b1b3fc56467c844b6d1d1d27c30
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=best+picture+editing+app+apk'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility. 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.cc/pify?keyword=best+picture+editing+app+apk
    • http://files.stalbansepiscopalhouston.org/uploads/1/3/2/7/132740756/2214274.pdf
    • http://files.calaveraslafco.org/uploads/1/3/1/6/131637919/subewusudazol.pdf
    • http://files.compasswellnesscoaching.com/uploads/1/3/0/8/130874543/1997618.pdf
    • http://files.stalbansepiscopalhouston.org/uploads/1/3/2/7/13
    • https://cdn.shopify.com/s/files/1/0430/5816/7959/files/30278595759.pdf
    • https://cdn.shopify.com/s/files/1/0434/6671/9385/files/jevowidedowojes.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/sesixagodawuwivamojaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/fofamaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/poxemokadulodexodaruwag.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/63703918974.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/fawazodipuzekivozora.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/96845283622.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/19336936590.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1146/files/54787122349.pdf
    • https://cdn.shopify.com/s/files/1/0435/7583/6840/files/likeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1415/files/32544661436.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2102/files/palakubadaji.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/3646681294.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
font_00_sfnt_off000075e6.bin
b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E6 6588 bytes
font_01_sfnt_off00008660.bin
ab776c881f989e9c3b6b20d603b65ca2a0f6d354a733044b8827b14aa1392f7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8660 5096 bytes
font_02_sfnt_off000097bd.bin
77c47befabe1cfc13c37a7975434190dfc25a42548fdd0a251d2a066f6ad76a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97BD 6236 bytes
font_03_sfnt_off0000ade4.bin
eb11a22af9f33bf4c615556e3ef5f271720d65b9ff74dcc0a18567e7ee5a8e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADE4 10748 bytes

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