Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8da4db386c21631…

MALICIOUS

PDF

38.3 KB Created: 2020-08-22 16:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 341b0d230f118ee94c002650bfb4a2f2 SHA-1: 5e0183754d1841a6a2ff9053f863938285118cc9 SHA-256: f8da4db386c21631b2fa26a6196abb2fb3dfad3fd232004d224c2beb42094531
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL pointing to 'ttraff.cc'. This URL is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, contains the same lure text and URLs as found in the heuristics, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of multiple PDF links and a malicious redirector indicates a delivery mechanism for further malicious content.

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.cc/pify?keyword=6th+grade+worksheets+on+adverbs
    • http://jibivos.carpetcleaningstpete.com/uploads/1/3/0/7/130738948/zikuvunowimabafasor.pdf
    • http://files.stevendupuisoil.com/uploads/1/3/1/4/131455543/wozif_noramugome.pdf
    • http://dixime.ridgepointdms.com/uploads/1/3/0/9/130969060/34f08455cde.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/simple_past_affirmative_form_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/6777/6919/files/diviruwan.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/guia_practica_de_piscicultura_en_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0428/9311/5548/files/39258650077.pdf
    • https://cdn.shopify.com/s/files/1/0434/6671/9385/files/13396843211.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/lofuzudemota.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/gidatoludupadeko.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_off0000573a.bin
bfcb57734562d4f26d096bfcd858fdb9bc8917735cb3c5739a4f1bca1c6c563d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x573A 5472 bytes
font_01_sfnt_off000069de.bin
1081202feff43f2d76a781e928b64a3324489647e383d00f99d0afe1c5118887		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DE 10296 bytes

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