Malicious PDF — malware analysis report

Static analysis result for SHA-256 74075e6a33657796…

MALICIOUS

PDF

47.1 KB Created: 2020-08-19 03:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6110296d518996a3dd2a75dd4e12a05 SHA-1: 1ed31d427421527a98e2f82de93e838fdd847bb7 SHA-256: 74075e6a3365779614cb1a5876ba4a029a2d9ffcf3000699e14463ae6dac7088
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a tactic of using seemingly benign content to mask malicious intent, likely to drive traffic to a malicious site for further exploitation or phishing. No scripts were extracted, but the PDF structure itself facilitates the attack.

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.ru/pify?keyword=chapter+4+detrital+wash+answers
    • http://files.rkgourdcreations.com/uploads/1/3/1/0/131070080/mikatiwotugako-dazil-budizu-notimesi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5336/7975/files/56714053671.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/29098664148.pdf
    • https://cdn.shopify.com/s/files/1/0431/1213/6855/files/36943538537.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/fezonu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/74471930172.pdf
    • https://cdn.shopify.com/s/files/1/0431/8062/1984/files/jotixuvumifofomifeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2092/files/off_road_buggy_car_racing_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/8882/2950/files/gufevuwiwuziragadusixin.pdf
    • https://cdn.shopify.com/s/files/1/0444/3491/5495/files/set_theory_bourbaki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/failure_data_analysis_reliability_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/safabumijobepo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2694/0067/files/tibisiwo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067cf.bin
002800a4821813a929c899fd6bd0ba57a8f832249628ea1c7521c704aaa157d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CF 2888 bytes
font_01_sfnt_off00007213.bin
b5281de974d93ab850399a57ac217254d39a0b03696ce98b456f81fb4382fcfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7213 5132 bytes
font_02_sfnt_off00008392.bin
72bc57c0457ebf7dc9739fec1cc54de770e15154677afaae4f6948469598440c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8392 2252 bytes
font_03_sfnt_off00008cfa.bin
a0e7d248f914f71c2439b66956da54cecd118f23607c71d3fa9324c585f2b1ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFA 9988 bytes

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