Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fff8222ad0877b5…

MALICIOUS

PDF

43.1 KB Created: 2020-08-18 17:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4cc3e77a99f4e9e9af01df8dabd69f2 SHA-1: 2b2a95011ed6e3188bd1215c7be88982802385ac SHA-256: 5fff8222ad0877b57a0d3b40543d047424259818a3fe8de43cb30c30becdd2b6
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm strategy. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed for malicious purposes, likely to lure users to malicious sites or manipulate search engine rankings.

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=formas+bidimensionales+perimetros+y+areas
    • http://files.terredetuni.com/uploads/1/3/1/4/131453843/1441379.pdf
    • http://files.lambersfisher.com/uploads/1/3/1/6/131606087/fikojuno-tanaz-zofaliwiwiguw.pdf
    • http://xipagegu.closets-now.com/uploads/1/3/0/9/130969472/8650237.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/29284881997.pdf
    • https://cdn.shopify.com/s/files/1/0436/9989/6475/files/best_html_to_api.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/xoxozitixerotani.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3639/files/hadoop_architect_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/38895322975.pdf
    • https://cdn.shopify.com/s/files/1/0429/6900/6236/files/donald_glover_stn_mtn_kauai_songs.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/tidamebanoja.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/lokenex.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/lifatiwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/23678732709.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52657742202.pdf
    • https://cdn.shopify.com/s/files/1/0434/7127/4146/files/wifunirojagiw.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_off0000669f.bin
25f53e21ac6f4c1a967f0bc7621604baf803fde3517d0a97c3bb6687b0abff63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669F 5300 bytes
font_01_sfnt_off0000788a.bin
c683e441845930906db0322888a14022f2519d157f51dfdd5f32f1b56efbdf96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x788A 11340 bytes

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