Malicious PDF — malware analysis report

Static analysis result for SHA-256 17882f8c25dbc78f…

MALICIOUS

PDF

48.5 KB Created: 2020-09-01 01:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5855ee92d23db8e270484f47734dda92 SHA-1: 777e7a281d12a49fd1b051bb14a1e33dd4edf4e1 SHA-256: 17882f8c25dbc78f44717cb2c8b294749a1d25f9ab628240dfb3c0bfa28e9d5c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is ttraff.cc, which is known to host malicious content. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also repeats the malicious URL and several benign-looking Shopify URLs.

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=cabasicanimation+transform+scale+swift
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6280/3097/files/ssh_folder_permissions.pdf
    • https://cdn.shopify.com/s/files/1/0438/1379/8050/files/goosebumps_abominable_snowman_of_pasadena.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7546/files/centrosome_structure_and_function.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/22594821776.pdf
    • https://cdn.shopify.com/s/files/1/0432/7014/4166/files/33458071005.pdf
    • https://cdn.shopify.com/s/files/1/0440/6309/6984/files/94603602451.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/basic_accounting_terms_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0440/1466/5878/files/anaconda_1_full_movie_in_english.pdf
    • https://static.usrfiles.com/ugd/c068f8_3582541922904d7293d38fb5c1ff45c6.pdf
    • https://static.usrfiles.com/ugd/538d67_94f2698259d54863aff5985b99fea60d.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/dusasiberij.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/62419441305.pdf
    • https://cdn.shopify.com/s/files/1/0440/2610/1925/files/bkav_cai_offline.pdf
    • https://cdn.shopify.com/s/files/1/0436/1119/3501/files/blunt_abdominal_trauma_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/0400/1443/files/99839375395.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_off000076e8.bin
e5f8c2251f491d82fde3157a25847dc1f1061f302e8bc5f6929a1b182cd4a890
pdf-font-stream PDF embedded font (sfnt) at offset 0x76E8 5164 bytes
font_01_sfnt_off0000886e.bin
c59d03bb3992158a3d24bc277447ba2f5f5dae27ff50fd3c753f6b086f724815
pdf-font-stream PDF embedded font (sfnt) at offset 0x886E 14156 bytes