Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1b3361445e48ab…

MALICIOUS

PDF

44.6 KB Created: 2020-08-11 05:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb6fe0f9515fa74de3221a0d0e133af3 SHA-1: 2911a59729b2c0b72d232827602639ed0b189471 SHA-256: 8b1b3361445e48abad14e3f1fd123fc0730366c7e890158bfb24a2c1553628ee
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL identified is https://ttraff.com/pify?keyword=cottrell+critical+thinking+skills+pdf, which is part of a larger infrastructure of 17 generated SEO PDF links. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at redirecting the user to 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.com/pify?keyword=cottrell+critical+thinking+skills+pdf
    • http://files.nourishthefire.com/uploads/1/3/1/8/131858916/c5a6c3.pdf
    • http://files.mendenhall-lab.org/uploads/1/3/2/7/132741052/xorosopabezad-dixigaseme-bomal.pdf
    • http://files.angelsrestretreat.com/uploads/1/3/0/7/130775998/gafafewejogizo-fupatid-xaxuwumomuxuw.pdf
    • http://files.athleticteamspirit.com/uploads/1/3/1/6/131607103/a584aa.pdf
    • http://files.thesoapshepherd.com/uploads/1/3/2/7/132740700/kibitowosigowuw_tozabatirome.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4453/files/mobebofovuwafekexuwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/reverse_polish_notation_c.pdf
    • https://cdn.shopify.com/s/files/1/0428/8570/9987/files/forez.pdf
    • https://cdn.shopify.com/s/files/1/0432/8564/3420/files/borokume.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6975/files/71149987983.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7650/files/rakus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9144/4390/files/atresia_intestinal_congenita.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/59348719296.pdf
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/axolotl_francais.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/79410250371.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8069/files/99408787102.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/10495611252.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/
    • https://cdn.shopify.com/s/fi

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062cb.bin
ae971a3c2be0b0838843b4f32e6459bcb8887a6e4b64dc5dc7c5a208439272d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62CB 5292 bytes
font_01_sfnt_off000074b8.bin
692f342f6f78850926426c2920abfab9945cf4e2317b4b7a4b075765bc0b7587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 9992 bytes
font_02_sfnt_off000096d0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96D0 4324 bytes

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