Malicious PDF — malware analysis report

Static analysis result for SHA-256 720c12cfe26fdc01…

MALICIOUS

PDF

48.6 KB Created: 2020-09-11 06:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a02935e901826bb6c146943b485facf4 SHA-1: fd22fd8c3707bb7762cf304387569604607f202b SHA-256: 720c12cfe26fdc01815697c1e48a2d486d41b889a767d3337a0b0575f3084a33
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body text, though partially corrupted, includes a URL that appears to be a lure for users searching for 'cancella chat whatsapp android'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern involves directing users to malicious infrastructure.

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.me/wix?keyword=cancella+chat+whatsapp+android
    • http://files.gillysplaceinkefalonia.co.uk/uploads/1/3/0/9/130969710/6463263.pdf
    • http://files.thenectarylkld.com/uploads/1/3/1/4/131437276/zobulidab_popukenukuwug_gugalipitoja_zutepaxuzobel.pdf
    • http://zorepu.fillinupmyteacup.com/uploads/1/3/1/4/131406717/4aefe2b652b87bb.pdf
    • http://files.lhec.org/uploads/1/3/2/6/132682235/0a40c5a84c7e85.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/16a96a_6d561308b97842f78cb9de973b158dcd.pdf
    • https://static.usrfiles.com/ugd/35e1ce_e029390ed4df45b2982c50aa1c27dc9e.pdf
    • https://cdn.shopify.com/s/files/1/0429/8198/2361/files/65862606474.pdf
    • https://cdn.shopify.com/s/files/1/0431/7079/1573/files/46900006921.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6331/files/poor_richard_s_almanack_1733.pdf
    • https://cdn.shopify.com/s/files/1/0429/6451/7023/files/vufofixi.pdf
    • https://static.usrfiles.com/ugd/c63dba_b52e5c67f4634db194cc754ca42bbd91.pdf
    • https://static.usrfiles.com/ugd/b28ae2_c355cd87498e41baa7e723ec7a155828.pdf
    • https://static.usrfiles.com/ugd/ecec20_dda744f52d4440ecb82cc862b4834078.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a72c0dbd08049159532716359c511d1.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_off00008216.bin
2b57ae71f23a1808dbd18e870c539709b043baffdefec77e8d68f2a9d23ab4b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8216 5160 bytes
font_01_sfnt_off000093a7.bin
c1293b41db9e420594cdadb141d48315bd6485bc70fca65b0053e0a9d5512450
pdf-font-stream PDF embedded font (sfnt) at offset 0x93A7 9908 bytes