Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c4595a41560a17…

MALICIOUS

PDF

40.0 KB Created: 2020-08-02 23:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39487f1b94f8a74380d6eea44003f989 SHA-1: 09caa5f1c8f0cdb876ab6833f19b7d3a21c53aef SHA-256: 65c4595a41560a1726f708469dc8bf1ba9108faab06668494b4ac8a4eadc10d2
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is part of a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, contains the target URL and references to shopify.com PDF links, suggesting a tactic to drive traffic to malicious or spam content. The ML classifier also strongly indicated maliciousness.

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=machinerys+handbook+pdf
    • http://files.saikyokarate.com/uploads/1/3/0/7/130738943/xetejexogamevozef.pdf
    • http://files.barbourpromotions.com/uploads/1/3/1/3/131378990/wijenumukupixat-buronu-jikawavaf.pdf
    • http://files.ryanpreeceracing.com/uploads/1/3/0/8/130814127/mijowolaf.pdf
    • http://files.reliefequineproducts.com/uploads/1/3/1/3/131383398/sezelajevidu_nimoxew_pegokizifuwewi_ritozolitupet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/0834/9592/files/77253061243.pdf
    • https://cdn.shopify.com/s/files/1/0432/1050/6404/files/vuxetevitojobe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xozujegemuzudileruzodedus.pdf
    • https://cdn.shopify.com/s/files/1/0433/8414/4037/files/nefemedom.pdf
    • https://cdn.shopify.com/s/files/1/0433/1474/1413/files/84585798359.pdf
    • https://cdn.shopify.com/s/files/1/0428/6906/3836/files/70561288557.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zovoxumaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6751/4788/files/diduduzajedon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kenetawibonilolususede.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/21471096668.pdf
    • https://cdn.shopify.com/s/files/1/0432/2767/6829/files/fosemekepabuzovirulera.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/nitedowupobuxafo.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_off00005db4.bin
7e8cc166a22afacdabc75de042eb767ddd31893e91098a7e84b672755e265c15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB4 5520 bytes
font_01_sfnt_off00007087.bin
9862e2fc852cdb457604fd1aa260f4b78de4cf2f43b9869a3f85a166713ada4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7087 10096 bytes

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