Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cefc71a7349cf4…

MALICIOUS

PDF

38.3 KB Created: 2020-08-12 10:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03b32ae6a558b64da87c7b584313708f SHA-1: de01236dbb0a8965764ae0332cdb43a07e3aff9f SHA-256: c8cefc71a7349cf4a4bac6daa70537b33978fc59ba2483ca461646dd78571e3a
150 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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Bsc pcm syllabus pdf' and the malicious URL, suggesting a lure to trick users into visiting malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates a likely phishing or malware distribution attempt.

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/wb?keyword=bsc%20pcm%20syllabus%20pdf
    • http://files.twigadesigns.com/uploads/1/3/1/0/131070152/xifefatuliviw-digez-tilolu-kefodozitaxep.pdf
    • http://files.lipstikalley.com/uploads/1/3/2/6/132695546/dubemuloxataxawilur.pdf
    • http://files.michellelewiscandleco.com/uploads/1/3/0/8/130874066/firobapadaw_zazewezaginuke.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0739/files/78256767213.pdf
    • https://cdn.shopify.com/s/files/1/0434/8998/4674/files/xiguvagatovasomowax.pdf
    • https://cdn.shopify.com/s/files/1/0433/9823/4270/files/91712941118.pdf
    • https://cdn.shopify.com/s/files/1/0436/3694/9152/files/78139711799.pdf
    • https://cdn.shopify.com/s/files/1/0444/3661/9431/files/articulo_de_opinion_sobre_el_aborto.pdf
    • https://cdn.shopify.com/s/files/1/0440/5483/9461/files/zikudadanunifegonuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/5674/3079/files/90513907042.pdf
    • https://cdn.shopify.com/s/files/1/0431/4949/2384/files/20600653743.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7804/files/pividifimodulorejijom.pdf
    • https://cdn.shopify.com/s/files/1/0434/0639/3496/files/juxiwas.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/kevuwiwewasudafo.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_off00005849.bin
2c56a8fee6760294a72241f834460ec17cfc6d8762f2fe27acaebfff97007e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5849 5496 bytes
font_01_sfnt_off00006af1.bin
3e5d70426b11b1a82b8014e8120c43b866d57ddcce167939e9a14f3b9c3bb782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF1 9784 bytes

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