Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff1a323f28e4efb…

MALICIOUS

PDF

47.0 KB Created: 2020-08-05 09:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02ea289b06a3a5c791b99a3ff1a5f0ab SHA-1: 49bd57fe6a72f8c086c3eaee76b3aba63b4ab911 SHA-256: 0ff1a323f28e4efb61de5ecb22d0f12a8bba09d9f3a3fce9cc2201cf6a9ddc08
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=credit+risk+in+banks+pdf', suggesting a lure to a malicious site. The presence of a large number of external PDF links further indicates a link farm or SEO manipulation tactic, likely to obscure the malicious redirector.

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=credit+risk+in+banks+pdf
    • http://files.humanitycenter4change.org/uploads/1/3/0/8/130814043/3c78265436.pdf
    • http://baborun.mengkayeducation.com/uploads/1/3/2/7/132740435/pudukak_befinusu_taromuvapux_kimin.pdf
    • http://files.griefcenterswco.org/uploads/1/3/2/7/132711999/9162186.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64831632673.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/87401495449.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2102/files/koxogoxen.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/kufiku.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/47349171687.pdf
    • https://cdn.shopify.com/s/files/1/0428/7207/8499/files/wufazusuluzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8036/8796/files/dipizepumuteputot.pdf
    • https://cdn.shopify.com/s/files/1/0435/7334/6465/files/sitopugimoridulopivejiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/wibujezojijugedipoxugiko.pdf
    • https://cdn.shopify.com/s/files/1/0432/7342/0965/files/tulepelibasopumiwij.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/40577160691.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/fabizasobojidiboji.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_off00007b9a.bin
2d683e32693fd857d95ec11b031944e5be01886dad1237e19c3b77090a5b72c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9A 5112 bytes
font_01_sfnt_off00008d09.bin
7f1a787d1828ed7fe48faebeab19b1045c2b378a1473ec60f585f4db2e018da5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D09 10036 bytes