Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b172d5e08a77128…

MALICIOUS

PDF

51.4 KB Created: 2020-08-31 14:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0762254bbbfcb14a71c12ddbd32a99cc SHA-1: f40f21d1e5982613fd97db810cd71a3eb75b6919 SHA-256: 6b172d5e08a77128a94ed7a06e37620621e39d15357db2531cca56c0021d3657
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a primary link to a known malicious redirector. The document body, though heavily obfuscated, contains a reference to the malicious URL. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm.

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/wix?keyword=happy+marriage+wishes+images
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/8769/9876/files/40418813459.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/73962293764.pdf
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/candle_making_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/5047/5413/files/puvugagotowikizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/diraxula.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/17417113065.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/tokutivugiwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/71312540312.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/56902369968.pdf
    • https://cdn.shopify.com/s/files/1/0447/3955/9573/files/ayyappan_tamil_bhajan_songs.pdf
    • https://cdn.shopify.com/s/files/1/0431/6181/3152/files/hashflare_reinvest_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7711/files/61430695181.pdf
    • https://cdn.shopify.com/s/files/1/0458/0166/8774/files/check_list_vehiculos.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6324/files/agilent_hplc_software.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d45.bin
a657e72ccec777f87e701bca962a778baf7ebe7396076d45797e7638b41249f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D45 5356 bytes
font_01_sfnt_off00008f6a.bin
cb518cb8f9b02d4040c83710d32ee410694b5cfc195f78eb8c4b26261dc2f722
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6A 8800 bytes
font_02_sfnt_off0000ad9a.bin
e9173dcda78706242d8f7b29f26b60d462c3532871f846dd5a94e5d2436995d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9A 5036 bytes