Malicious PDF — malware analysis report

Static analysis result for SHA-256 006e6cfbf065b881…

MALICIOUS

PDF

48.5 KB Created: 2020-08-19 23:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d01103053b16d9ad50bf97f5c722e75 SHA-1: 2eb2abb52134eba2bff954ef1eea869dc770f58d SHA-256: 006e6cfbf065b88147eb5ef9de7423ef816e9b5223d16bc9ffb1c77becd35df8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.ru', which is used to obscure the final destination. The document body, though heavily obfuscated, contains references to 'Knewton alta answer key' and URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=knewton+alta+answer+key
    • http://files.hennessyspeechanddrama.com/uploads/1/3/0/7/130776208/9565686.pdf
    • http://zamuzevup.bcox1.com/uploads/1/3/1/8/131871592/mafatobemutam_nalovu_petodaputebeni_rawugatuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/zanajariwumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1348/0354/files/3232310394.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/72695924976.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/nerf_alpha_trooper_cs_6.pdf
    • https://cdn.shopify.com/s/files/1/0434/4076/7132/files/import_google_font_stylesheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/1230/7618/files/30827520605.pdf
    • https://cdn.shopify.com/s/files/1/0433/4652/6361/files/app_bwin_poker_per_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/5173/5448/files/sipubedefujuberawozuwubu.pdf
    • https://cdn.shopify.com/s/files/1/0459/2805/4951/files/numuke.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/zuxumokaxazalegavefadeta.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/wupigivulo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13534048661.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072c9.bin
29cec7baa25d30ea67e1c1115530e445dbc640ca7f9ba8e2d2daff85dbe47ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C9 4648 bytes
font_01_sfnt_off000082a6.bin
422760e9cef665c6b96ae4de9dffbd19de698cef58729dd5e3064db1709a71c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A6 10856 bytes
font_02_sfnt_off0000a6fc.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6FC 4324 bytes

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