Malicious PDF — malware analysis report

Static analysis result for SHA-256 1259eb3d2a85cdb1…

MALICIOUS

PDF

46.8 KB Created: 2020-07-31 07:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10d7318fc4deecac376761e59580b153 SHA-1: d0498fec84d81eb00df7dd1a267761c1bc11bed2 SHA-256: 1259eb3d2a85cdb1e8851877fd3fe9ea44beb7bdc17eda12520a147ca01e2aac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of malicious intent.

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=ascochyta+rabiei+pdf
    • http://files.propertasty.com/uploads/1/3/2/6/132695384/labivigasamibo.pdf
    • http://files.charlotteshelix.net/uploads/1/3/2/6/132681194/siratulovivegeg_bikizuboz_pebajezed_pomurewumebun.pdf
    • http://files.voodoocosmetics.org/uploads/1/3/1/4/131453718/puwifisejakawupuwij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/35949449171.pdf
    • https://cdn.shopify.com/s/files/1/0432/9052/5849/files/temarulodemabowobojozel.pdf
    • https://cdn.shopify.com/s/files/1/0432/5549/6866/files/dapofamezozobarimifa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/31792637125.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/6600083082.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6387/files/38898798445.pdf
    • https://cdn.shopify.com/s/files/1/0431/5270/3645/files/222542787.pdf
    • https://cdn.shopify.com/s/files/1/0437/8991/0165/files/lunuwakiririsot.pdf
    • https://cdn.shopify.com/s/files/1/0438/8965/5960/files/92525236491.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/vabovolenivovumaxajumen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nedodakamilutejevojive.pdf
    • https://cdn.shopify.com/s/files/1/0429/6540/1753/files/tobijazade.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/lenifenurumobo.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_off0000781b.bin
5fe7c981ddb1829bdfadfa2d90d5c28b285414c2234b714f6c10c4111ccdd9ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x781B 5124 bytes
font_01_sfnt_off0000899b.bin
dccb8b1e9891c2cfc3a80fcc3e4033c5db4654b7af95516d5a20f91cb87f9dce
pdf-font-stream PDF embedded font (sfnt) at offset 0x899B 10340 bytes