Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b5565225ad1f2d…

MALICIOUS

PDF

41.6 KB Created: 2020-08-07 06:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2d7d4a55d1c1d141cba4e87112ed387 SHA-1: 9418c86f50cde0682010da56cc39aa10dfe715b1 SHA-256: d2b5565225ad1f2d00f06255c79c35145430fa485f0fb73b1434ce67308cd8de
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text related to 'learning english worksheets' and includes the malicious URL. This suggests a social engineering attempt to trick users into visiting a potentially harmful site, likely for phishing or malware distribution.

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/pify?keyword=learning+english+worksheets+for+beginners+pdf
    • http://files.deinteko.com/uploads/1/3/1/8/131871907/fe2e518d47c9.pdf
    • http://files.ejpalmieri.com/uploads/1/3/2/6/132681556/jodakenotog.pdf
    • http://files.thecottageschool.info/uploads/1/3/2/3/132303035/niburi.pdf
    • http://files.secondsundayride.org/uploads/1/3/0/7/130775979/mokole-pagop.pdf
    • https://cdn.shopify.com/s/files/1/0436/0496/7581/files/13496944423.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/vebiwavimanowimiwivino.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/mapuzipivumono.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5712/files/capital_city_of_all_countries.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39646295774.pdf
    • https://cdn.shopify.com/s/files/1/0433/7470/6853/files/82145851482.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1751/files/zawelepopejipukazugexere.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/jamipisamawaxevekatoxag.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2039/files/55526614871.pdf
    • https://cdn.shopify.com/s/files/1/0433/7614/8643/files/minecraft_1._14_give_generator.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/smith_and_wesson_469.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pajovi.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_off000063f1.bin
ad01c09d914e22ceda4330a18eceda1999a92bc4a77e9dd78648ae44d5cb7b39
pdf-font-stream PDF embedded font (sfnt) at offset 0x63F1 5540 bytes
font_01_sfnt_off000076d2.bin
5bc2de965e10b5505afe23a2c0674c77818d5567fbce23db4e177a061ff832b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x76D2 10080 bytes