Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90efaaa018662b0…

MALICIOUS

PDF

34.8 KB Created: 2020-08-21 13:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5edb78de11ae2b0dfae720facc0149d SHA-1: 142d04f2a8bbdcc02a51d05f045b992930717169 SHA-256: a90efaaa018662b0f9f6e76cddd3ef09538e78d73318019440f400a238168a04
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a document title, aiming to trick users into visiting a harmful site. The document body, though heavily obfuscated, contains the target URL. The presence of numerous external PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=exercises+reported+speech+orders+pdf
    • http://pijisuk.nycridingacademy.org/uploads/1/3/0/9/130969352/xureliduz.pdf
    • http://jamudapi.southwark-golden-oldies.com/uploads/1/3/1/4/131452836/xujiwijofazadiwur.pdf
    • http://files.enricorobusti.com/uploads/1/3/2/6/132683080/vonusirovinut.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6324/files/90825854780.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5974/files/69775593301.pdf
    • https://cdn.shopify.com/s/files/1/0433/2693/1099/files/acute_bronchitis.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6055/files/human_emotions_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/50927838848.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/java_untuk_minecraft_1._12_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/bigopazajolizavep.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/seismic_attributes_for_prospect_identification_and_reservoir_characterization.pdf
    • https://cdn.shopify.com/s/files/1/0428/2528/5798/files/66396417492.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28391359898.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/anarchist_cookbook_free_download.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ab8.bin
019d3daeb2fb44aacd6edb9803c8808f0c4c2348e8119e1da2720991e67a04c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AB8 5028 bytes
font_01_sfnt_off00005bd0.bin
8d8e879661747f6eeb4ba1cdfaf64fa87b94dc987bd34ced8d8393034d4e3793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD0 10224 bytes

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