Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa127116aba5b38…

MALICIOUS

PDF

50.5 KB Created: 2020-08-30 22:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9e23a9b78448729c6768f04b5b6f200 SHA-1: 59de6ae4c9d073d23954e5557239459039445a70 SHA-256: 2fa127116aba5b38aa5b9ddbd27f40a103859fb34f182de5e047775a460b2c5b
152 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links. The primary malicious URL identified is https://ttraff.com/wix?keyword=las+monta%25C3%25B1as+de+la+locura+pdf, which is likely the initial lure. The document body, though heavily obfuscated, contains references to this URL and other embedded links, reinforcing the attack pattern.

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/wix?keyword=las+monta%25C3%25B1as+de+la+locura+pdf
    • https://static.usrfiles.com/ugd/b8c837_ca669c5e18164dc7b1772e1030984331.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f9fc17a04d442549d9519356a8adbaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_3544602e03e64af2b92d58f3b9961831.pdf
    • https://cdn.shopify.com/s/files/1/0432/3278/8648/files/68857028875.pdf
    • https://cdn.shopify.com/s/files/1/0449/6978/7560/files/alfabeto_griego_mayusculas_y_minusculas.pdf
    • https://cdn.shopify.com/s/files/1/0448/0362/1025/files/analisis_y_descripcion_de_puestos.pdf
    • https://cdn.shopify.com/s/files/1/0438/0514/7298/files/4273923315.pdf
    • https://cdn.shopify.com/s/files/1/0432/7967/9656/files/58700911641.pdf
    • https://cdn.shopify.com/s/files/1/0434/1556/8546/files/kogolilumuxejosimag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.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_off0000845e.bin
f96f582002fc4f37871d1d1eac6d5ed8761d953c4d5844fa2a30c0e36dabaf09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x845E 5456 bytes
font_01_sfnt_off0000968f.bin
a61cbebbad9515ae5a78fb464366d0e9d683092f50035f8e56f7c2af6d6951b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x968F 11348 bytes

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