Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c81583e4db6423f…

MALICIOUS

PDF

55.4 KB Created: 2020-08-02 04:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5067fa4d25cde6bbd00952bc5b090985 SHA-1: facf73ea0818726e9bebfbf76a5720f4f2225779 SHA-256: 6c81583e4db6423f76dc925c73436dfafcfdba32b73589998a412b4a3b09b622
162 Risk Score

Malware Insights

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

The PDF contains a lure related to 'accounting principles 10th edition pdf' and embeds numerous links, one of which points to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the document body contains obfuscated text along with a URL that appears to be part of a link farm designed to distribute malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=accounting+principles+10th+edition+pdf
    • http://files.ruthworkssf.com/uploads/1/3/0/9/130969440/b7ce53c1aa3b4.pdf
    • http://files.carolinemiekinaillustration.com/uploads/1/3/1/1/131164081/6229087.pdf
    • http://files.moneygramvnvn.com/uploads/1/3/1/6/131637125/mukura_zezuvoxomuwo_defegapu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6917/8017/files/lozizusigofavezab.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/zelowuvezijopiwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/12439975590.pdf
    • https://cdn.shopify.com/s/files/1/0435/9664/4511/files/22592046034.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/babidumevovilisago.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/xudol.pdf
    • https://cdn.shopify.com/s/files/1/0437/5055/5799/files/rodeo_travis_scott_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/87445220384.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/57912478016.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/54370202961.pdf
    • https://cdn.shopify.com/s/files/1/0432/8803/5486/files/vewazevesunixarob.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/kotona.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_off00008ddb.bin
e58e920baffb0833ecd2fe8fb87c0f8cdad529ece56b0c3b788954d3183f24f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDB 5388 bytes
font_01_sfnt_off0000a039.bin
b011f52d77a67901802789f4bd8af65eefd4523a502eb3b40aaeeb73dba1775f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA039 15344 bytes

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