Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b06947b1a45eec4…

MALICIOUS

PDF

39.5 KB Created: 2020-08-15 03:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 962963236f5f63f1b703905709d08cb0 SHA-1: 7ce98e84f4380edca48ee86efb8eb8d85b2dc762 SHA-256: 6b06947b1a45eec452c7bb27f3dc053819a4dd74cd20c3808778431a03283936
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 ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to attract traffic and potentially distribute malware or phish users. The presence of a malicious redirector URL is the primary indicator of malicious intent.

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/pify?keyword=bd+diesel+performance+products
    • http://files.homesofhopeforvida.org/uploads/1/3/1/3/131380845/susovuzuzesaj.pdf
    • http://files.nextjeninspections.com/uploads/1/3/1/8/131871699/mejogu.pdf
    • http://files.imarsonline.com/uploads/1/3/1/3/131380413/6c76ebc2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/lasosavidofonoxikagubo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1674/1286/files/zuxipilobexatito.pdf
    • https://cdn.shopify.com/s/files/1/0428/6581/9814/files/42079800962.pdf
    • https://cdn.shopify.com/s/files/1/0438/5649/4757/files/zelidid.pdf
    • https://cdn.shopify.com/s/files/1/0434/5243/2537/files/irritable_bowel_syndrome_guidelines_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/4670906974.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2650/files/gerukatoduwubevifeval.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69696378660.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/2823125474.pdf
    • https://cdn.shopify.com/s/files/1/0430/0265/8979/files/active_passive_present_simple_past_simple_exercises.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_off00005cb9.bin
e9230d8fdd62bac77cde16ac563dc37663ebc07d5d6912c898b201267cb77361
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB9 5348 bytes
font_01_sfnt_off00006ecf.bin
ddf0b9d2bb05eb9b332f998bcab6b4db57aa0c58431c073acdd87b8c462b5dd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECF 10228 bytes