Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9055e6495cd80ab…

MALICIOUS

PDF

32.2 KB Created: 2020-08-30 13:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db34d64c78747d05194769c60540b9cf SHA-1: acfb663fbd296a0bd25231643908e2654e672b3a SHA-256: a9055e6495cd80abf53a31d80e372312ef220fe16fb14060f44312fba2224e07
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to a link farm hosted on static.usrfiles.com, and one critical link to a known malicious redirector at ttraff.cc. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the document's purpose is to trick the user into clicking it. No scripts were extracted from this sample.

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.cc/wix?keyword=griffith+genetica+libro+pdf
    • https://static.usrfiles.com/ugd/b8c837_2b4b8a42121b471087c8429618d7b874.pdf
    • https://static.usrfiles.com/ugd/b8c837_4341bfa6057046c2a53f477a382d361e.pdf
    • https://static.usrfiles.com/ugd/b8c837_959812f71b52462b9c83cde258792389.pdf
    • https://static.usrfiles.com/ugd/299074_1849422f621a4107a094ee658549d61e.pdf
    • https://cdn.shopify.com/s/files/1/0436/0850/6531/files/jetepofik.pdf
    • https://cdn.shopify.com/s/files/1/0450/4682/5110/files/4chan_aco_brap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3760/files/23745192696.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec61177aad09440d8d83a3cfdb37ee88.pdf
    • https://static.usrfiles.com/ugd/7ff653_8d84d8de675347e480c19861732ef8ce.pdf
    • https://static.usrfiles.com/ugd/e3ff21_81549dd43c0f490f95d417c847c5c561.pdf
    • https://static.usrfiles.com/ugd/ce14f3_9da0ab4298424105a4c08efcc30c42f2.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_off000040db.bin
35ae95e571e90a1ef1a824407bdb7bf55e17d27428b08ece189815cd04281efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40DB 5412 bytes
font_01_sfnt_off00005333.bin
a666f6e848f093e1c39ba9fcc59f3562fd0348e580d7e1de896942d178b75a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5333 9624 bytes

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