Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da4fb4873eb9fd4…

MALICIOUS

PDF

56.5 KB Created: 2020-08-06 19:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4516b9b936c2191554007bd48643802 SHA-1: b56e6edc6c8b88c45b5947bf087f64e3e9e74cb2 SHA-256: 6da4fb4873eb9fd47c4ea4ee49cb629e0becd44a12362cf73bbff8ee396776ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=symantec+bluecoat+proxy+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting a phishing or redirection attempt.

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=symantec+bluecoat+proxy+pdf
    • http://files.theblendedfamilyfoundation.com/uploads/1/3/1/4/131437755/woxufu-liwurezu-fukajunuve.pdf
    • http://buzipab.birdhousepdx.com/uploads/1/3/1/4/131437987/wolaledebobojulo.pdf
    • http://files.shopbarsandrec.com/uploads/1/3/2/6/132682063/2378350.pdf
    • http://files.fatimamontieldesign.com/uploads/1/3/1/0/131070171/xajowabi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/xikuzebigeleso.pdf
    • https://cdn.shopify.com/s/files/1/0436/8180/8549/files/teperagux.pdf
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/99116553250.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/75363600219.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/41997341789.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1791/files/xilukigifukukulipotujeluk.pdf
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/goruvowivomu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5906/9599/files/xugugil.pdf
    • https://cdn.shopify.com/s/files/1/0436/8000/6294/files/56918319419.pdf
    • https://cdn.shopify.com/s/files/1/0438/2782/2749/files/zovegarorixomelezeriba.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/5308407949.pdf
    • https://cdn.shopify.com/s/files/1/0436/7345/2697/files/towukigudujevapuwaraxujo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009ec0.bin
952712fed8c359daf5732e0711d0e519b681de56600e26f5eaf57b76c8507647
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC0 5536 bytes
font_01_sfnt_off0000b185.bin
b66a8ba175cce611a59a7233b387ed8cce429ea9d785bcb4d3328639305532c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB185 10408 bytes