Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa821f73b137318…

MALICIOUS

PDF

42.1 KB Created: 2020-09-01 01:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed36d3e69871bfce7f784e856c02aa68 SHA-1: 2cd5d7050d6f9c3b7ea5535a8da29a68a0e500d7 SHA-256: 7aa821f73b137318e675839071b3f0a9b9479f768cd681d4f69a96197083c194
154 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL ttraff.cc. The document body, though heavily obfuscated, contains this malicious URL and numerous other URLs pointing to seemingly benign PDF files hosted on Shopify and usrfiles.com, likely to mask the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of a known malicious redirector URL confirms the document's harmful nature.

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/wix?keyword=elevated+platform+l%25C3%25A0+g%25C3%25AC
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/bca_4th_sem_math_notes.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/pabewopawagineniz.pdf
    • https://cdn.shopify.com/s/files/1/0438/1255/2864/files/elevator_speech_introduction_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8250/files/redamawinax.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e11ff3e91fc41cd85f632d0b3ccf2ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_039835a708814282a1dc5d2e04d0ec66.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_aad3fb12cc3f4d74b73172fddfccb7e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_222e21fa17104e15808008453b568317.pdf
    • https://static.usrfiles.com/ugd/909b15_7c2f57e25fcc4b17800a6b5ad4478940.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_cf044b891db04dffbd95b45b942dcdfd.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/el_derecho_mercantil.pdf
    • https://cdn.shopify.com/s/files/1/0439/1007/0440/files/kigevozotolujaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/9370/4356/files/btob_beautiful_pain.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_off00005d86.bin
5892ccaaddf3aa20e9d790e41b3e2a0eb4df7663dd75f1226bfeae3420294b26
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D86 5488 bytes
font_01_sfnt_off00006f9e.bin
769fc931cf83527eef90e82e3b1dfaf45a8eef1a7eced261ca4988a54794d9c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9E 16412 bytes