Malicious PDF — malware analysis report

Static analysis result for SHA-256 63834f447d9d920a…

MALICIOUS

PDF

51.8 KB Created: 2020-07-30 13:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1174d7ea447f6672560399dfc5f4af6e SHA-1: eb358e4228efb81011e36f93873a1a471521acf7 SHA-256: 63834f447d9d920a2b52d35078b85dd072d7dba7a28c71a7fcba5702cd3dfb19
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a redirector link to malicious infrastructure. Another critical heuristic identified it as a PDF SEO link farm, suggesting a tactic to artificially inflate search engine rankings or drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links and the SEO link farm technique strongly suggest an attempt to redirect users to harmful content.

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=aeroponics+guide+pdf
    • http://files.apollonasglykas.com/uploads/1/3/0/9/130969775/bidezevirivale.pdf
    • http://files.burtthompson.net/uploads/1/3/1/4/131482991/vekojob_wizokawixenaw_movamiduba.pdf
    • http://files.shandsschool.org/uploads/1/3/0/7/130739971/ba41b52a04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0288/7322/files/mikodirigogifatipojosiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4302/8120/files/vasox.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/70994670129.pdf
    • https://cdn.shopify.com/s/files/1/0433/7234/7550/files/boresojusunugirajej.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/99614828282.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/nonufuwazojojeripeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4846/files/molofigufof.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/kexizosenojonelo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4158/files/43992633287.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/bijuwusetijasumija.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/babasetaxoguvivowe.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_off00008eb3.bin
a530ae0c6c7570352a5e47c0801360bf12e98978231eb0ccc72a0657d67baac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB3 4872 bytes
font_01_sfnt_off00009f4b.bin
c8a9292d9c6e0b516869cd3bd19ee64ef8b3de7451cae350b686b33b30199dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F4B 10268 bytes

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